diff --git a/apps/desktop/preload/apis/chat.ts b/apps/desktop/preload/apis/chat.ts
index 24a78b1a..7d617c7b 100644
--- a/apps/desktop/preload/apis/chat.ts
+++ b/apps/desktop/preload/apis/chat.ts
@@ -12,7 +12,7 @@ interface ChatImportResult {
   sessionId?: string
   error?: string
   importMode?: 'created' | 'incremental'
-  matchedBy?: 'stable-id' | 'trailing-messages'
+  matchedBy?: 'source-session-id' | 'stable-id' | 'trailing-messages'
   newMessageCount?: number
   duplicateCount?: number
   diagnostics?: {
diff --git a/apps/desktop/preload/index.d.ts b/apps/desktop/preload/index.d.ts
index 6f961641..b67b9c7d 100644
--- a/apps/desktop/preload/index.d.ts
+++ b/apps/desktop/preload/index.d.ts
@@ -43,7 +43,7 @@ interface ChatImportResult {
   sessionId?: string
   error?: string
   importMode?: 'created' | 'incremental'
-  matchedBy?: 'stable-id' | 'trailing-messages'
+  matchedBy?: 'source-session-id' | 'stable-id' | 'trailing-messages'
   newMessageCount?: number
   duplicateCount?: number
   diagnostics?: ImportDiagnostics
diff --git a/packages/node-runtime/src/export/format-exporter.ts b/packages/node-runtime/src/export/format-exporter.ts
index cc85e335..81a5d40d 100644
--- a/packages/node-runtime/src/export/format-exporter.ts
+++ b/packages/node-runtime/src/export/format-exporter.ts
@@ -106,7 +106,12 @@ function parseOptionalArray<T>(value: string | null): T[] | undefined {
   }
 }
 
-function exportAsJson(db: DatabaseAdapter, messages: MessageRow[], sessionName: string): string {
+function exportAsJson(
+  db: DatabaseAdapter,
+  messages: MessageRow[],
+  sessionName: string,
+  sourceSessionId: string
+): string {
   const meta = db
     .prepare(
       `SELECT name,
@@ -147,6 +152,7 @@ function exportAsJson(db: DatabaseAdapter, messages: MessageRow[], sessionName:
       groupId: meta.groupId || undefined,
       groupAvatar: meta.groupAvatar || undefined,
       ownerId: meta.ownerId || undefined,
+      sourceSessionId,
     },
     members: members.map((member) => ({
       platformId: member.platformId,
@@ -219,7 +225,7 @@ export function exportWithFormat(
         content = exportAsTxt(messages, params.sessionName)
         break
       case 'json':
-        content = exportAsJson(db, messages, params.sessionName)
+        content = exportAsJson(db, messages, params.sessionName, params.sessionId)
         break
       case 'markdown':
         content = exportAsMarkdown(messages, params.sessionName)
diff --git a/packages/node-runtime/src/import/auto-import-matcher.test.ts b/packages/node-runtime/src/import/auto-import-matcher.test.ts
index fc88ce6f..c6fcaea9 100644
--- a/packages/node-runtime/src/import/auto-import-matcher.test.ts
+++ b/packages/node-runtime/src/import/auto-import-matcher.test.ts
@@ -32,13 +32,14 @@ function writeChatLabJsonl(
   filePath: string,
   meta: SourceMeta,
   members: SourceMember[],
-  messages: ParsedMessage[]
+  messages: ParsedMessage[],
+  sourceSessionId?: string
 ): void {
   const lines = [
     {
       _type: 'header',
       chatlab: { version: '0.0.2', exportedAt: 1783840000 },
-      meta,
+      meta: { ...meta, sourceSessionId },
     },
     ...members.map((member) => ({ _type: 'member', ...member })),
     ...messages.map((message) => ({
@@ -171,6 +172,77 @@ test('matches a unique private session by stable owner and participant ids', asy
   )
 })
 
+test('uses a validated ChatLab source session id to disambiguate stable matches', async (t) => {
+  const tempDir = makeTempDir()
+  t.after(() => fs.rmSync(tempDir, { recursive: true, force: true }))
+
+  const meta: SourceMeta = {
+    name: 'Private chat',
+    platform: 'wechat',
+    type: 'private',
+    ownerId: 'owner',
+  }
+  const members = [
+    { platformId: 'owner', accountName: 'Owner' },
+    { platformId: 'peer', accountName: 'Peer' },
+  ]
+  const messages = [textMessage('peer', 1783860000, 'hello')]
+
+  seedSession(path.join(tempDir, 'source-session.db'), meta, members, messages)
+  seedSession(path.join(tempDir, 'duplicate-session.db'), meta, members, messages)
+  writeChatLabJsonl(path.join(tempDir, 'source.jsonl'), meta, members, messages, 'source-session')
+
+  assert.deepEqual(
+    await resolveAutoImportTarget(
+      path.join(tempDir, 'source.jsonl'),
+      createDeps(tempDir, ['source-session', 'duplicate-session'])
+    ),
+    {
+      action: 'incremental',
+      sessionId: 'source-session',
+      matchedBy: 'source-session-id',
+    }
+  )
+})
+
+test('does not trust a ChatLab source session id that fails identity validation', async (t) => {
+  const tempDir = makeTempDir()
+  t.after(() => fs.rmSync(tempDir, { recursive: true, force: true }))
+
+  const sourceMeta: SourceMeta = {
+    name: 'Private chat',
+    platform: 'wechat',
+    type: 'private',
+    ownerId: 'owner',
+  }
+  const sourceMembers = [
+    { platformId: 'owner', accountName: 'Owner' },
+    { platformId: 'peer', accountName: 'Peer' },
+  ]
+  const messages = [textMessage('peer', 1783860000, 'hello')]
+
+  seedSession(path.join(tempDir, 'matching-a.db'), sourceMeta, sourceMembers, messages)
+  seedSession(path.join(tempDir, 'matching-b.db'), sourceMeta, sourceMembers, messages)
+  seedSession(
+    path.join(tempDir, 'unrelated.db'),
+    { ...sourceMeta, ownerId: 'different-owner' },
+    [
+      { platformId: 'different-owner', accountName: 'Other owner' },
+      { platformId: 'different-peer', accountName: 'Other peer' },
+    ],
+    [textMessage('different-peer', 1783860000, 'hello')]
+  )
+  writeChatLabJsonl(path.join(tempDir, 'source.jsonl'), sourceMeta, sourceMembers, messages, 'unrelated')
+
+  assert.deepEqual(
+    await resolveAutoImportTarget(
+      path.join(tempDir, 'source.jsonl'),
+      createDeps(tempDir, ['matching-a', 'matching-b', 'unrelated'])
+    ),
+    { action: 'create', reason: 'ambiguous' }
+  )
+})
+
 test('matches a unique session when its last five business messages appear consecutively in the source', async (t) => {
   const tempDir = makeTempDir()
   t.after(() => fs.rmSync(tempDir, { recursive: true, force: true }))
diff --git a/packages/node-runtime/src/import/auto-import-matcher.ts b/packages/node-runtime/src/import/auto-import-matcher.ts
index e99c1ad7..b92aef0c 100644
--- a/packages/node-runtime/src/import/auto-import-matcher.ts
+++ b/packages/node-runtime/src/import/auto-import-matcher.ts
@@ -6,7 +6,7 @@ import type { ImportProgressCallback } from './streaming-importer'
 
 const MATCH_WINDOW_SIZE = 5
 
-export type AutoImportMatchMethod = 'stable-id' | 'trailing-messages'
+export type AutoImportMatchMethod = 'source-session-id' | 'stable-id' | 'trailing-messages'
 
 export type AutoImportDecision =
   | { action: 'incremental'; sessionId: string; matchedBy: AutoImportMatchMethod }
@@ -137,11 +137,17 @@ export async function resolveAutoImportTarget(
   }
 
   if (hasStableIdentity) {
+    if (meta.sourceSessionId && stableMatches.includes(meta.sourceSessionId)) {
+      return { action: 'incremental', sessionId: meta.sourceSessionId, matchedBy: 'source-session-id' }
+    }
     if (stableMatches.length === 1) {
       return { action: 'incremental', sessionId: stableMatches[0], matchedBy: 'stable-id' }
     }
     return { action: 'create', reason: stableMatches.length > 1 ? 'ambiguous' : 'no-match' }
   }
+  if (meta.sourceSessionId && trailingMatches.includes(meta.sourceSessionId)) {
+    return { action: 'incremental', sessionId: meta.sourceSessionId, matchedBy: 'source-session-id' }
+  }
   if (trailingMatches.length === 1) {
     return { action: 'incremental', sessionId: trailingMatches[0], matchedBy: 'trailing-messages' }
   }
diff --git a/packages/parser-native/src/chatlab.rs b/packages/parser-native/src/chatlab.rs
index bdeedb3c..50dfb544 100644
--- a/packages/parser-native/src/chatlab.rs
+++ b/packages/parser-native/src/chatlab.rs
@@ -29,6 +29,7 @@ struct ChatlabMeta {
     group_id: Option<String>,
     group_avatar: Option<String>,
     owner_id: Option<String>,
+    source_session_id: Option<String>,
     /// true: members came from the top-level `members` array (full shape);
     /// false: collected from messages (id/name/nickname only), as in TS.
     members_from_head: bool,
@@ -87,6 +88,7 @@ struct MetaOut {
     group_id: Option<String>,
     group_avatar: Option<String>,
     owner_id: Option<String>,
+    source_session_id: Option<String>,
 }
 
 fn parse_meta(meta_raw: Option<&[u8]>, file_path: &str) -> ScanResult<MetaOut> {
@@ -139,6 +141,7 @@ fn parse_meta(meta_raw: Option<&[u8]>, file_path: &str) -> ScanResult<MetaOut> {
     let group_id = optional_str(&meta, "groupId", "meta")?;
     let group_avatar = optional_str(&meta, "groupAvatar", "meta")?;
     let owner_id = optional_str(&meta, "ownerId", "meta")?;
+    let source_session_id = optional_str(&meta, "sourceSessionId", "meta")?;
 
     // Filename fallback fires whenever the name resolved to the default,
     // mirroring `if (meta.name === '未知群聊')` in the TS parser.
@@ -153,6 +156,7 @@ fn parse_meta(meta_raw: Option<&[u8]>, file_path: &str) -> ScanResult<MetaOut> {
         group_id,
         group_avatar,
         owner_id,
+        source_session_id,
     })
 }
 
@@ -379,6 +383,7 @@ pub fn parse_chatlab(
         group_id: meta.group_id,
         group_avatar: meta.group_avatar,
         owner_id: meta.owner_id,
+        source_session_id: meta.source_session_id,
         members_from_head,
     })
     .map_err(|err| strict(format!("meta serialization failed: {err}")))?;
@@ -410,7 +415,7 @@ mod tests {
     fn parses_full_document() {
         let doc = r#"{
       "chatlab": {"version": "0.0.2", "exportedAt": 1700000000},
-      "meta": {"name": "测试群", "platform": "weixin", "type": "group", "groupId": "g1@chatroom", "groupAvatar": "https://x/y.jpg", "ownerId": "u1"},
+      "meta": {"name": "测试群", "platform": "weixin", "type": "group", "groupId": "g1@chatroom", "groupAvatar": "https://x/y.jpg", "ownerId": "u1", "sourceSessionId": "source-session"},
       "members": [
         {"platformId": "u1", "accountName": "Alice", "groupNickname": "小A", "aliases": ["Ally"], "avatar": "https://a", "roles": [{"id": "owner"}, {"id": "admin", "name": "管理"}]},
         {"platformId": "u2", "accountName": "Bob"}
@@ -428,6 +433,7 @@ mod tests {
         assert_eq!(m["chatType"], "group");
         assert_eq!(m["groupId"], "g1@chatroom");
         assert_eq!(m["ownerId"], "u1");
+        assert_eq!(m["sourceSessionId"], "source-session");
         assert_eq!(m["membersFromHead"], true);
         assert_eq!(out.members.len(), 2);
         assert_eq!(
diff --git a/packages/parser/src/formats/chatlab-jsonl.ts b/packages/parser/src/formats/chatlab-jsonl.ts
index 3723f2da..e7130914 100644
--- a/packages/parser/src/formats/chatlab-jsonl.ts
+++ b/packages/parser/src/formats/chatlab-jsonl.ts
@@ -49,6 +49,7 @@ interface JsonlHeader {
     groupId?: string
     groupAvatar?: string
     ownerId?: string
+    sourceSessionId?: string
   }
 }
 
@@ -171,6 +172,7 @@ async function* parseChatLabJsonl(options: ParseOptions): AsyncGenerator<ParseEv
             groupId: parsed.meta.groupId,
             groupAvatar: parsed.meta.groupAvatar,
             ownerId: parsed.meta.ownerId,
+            sourceSessionId: parsed.meta.sourceSessionId,
           }
           headerParsed = true
           yield { type: 'meta', data: meta }
diff --git a/packages/parser/src/formats/chatlab.ts b/packages/parser/src/formats/chatlab.ts
index d8778826..52558be6 100644
--- a/packages/parser/src/formats/chatlab.ts
+++ b/packages/parser/src/formats/chatlab.ts
@@ -141,6 +141,7 @@ async function* parseChatLab(options: ParseOptions): AsyncGenerator<ParseEvent,
           groupId: metaObj.groupId,
           groupAvatar: metaObj.groupAvatar,
           ownerId: metaObj.ownerId,
+          sourceSessionId: metaObj.sourceSessionId,
         }
       }
     }
diff --git a/packages/parser/src/native/chatlab-native.test.ts b/packages/parser/src/native/chatlab-native.test.ts
index 28bba866..4b3a7d42 100644
--- a/packages/parser/src/native/chatlab-native.test.ts
+++ b/packages/parser/src/native/chatlab-native.test.ts
@@ -84,6 +84,7 @@ const CANONICAL_FIXTURE = {
     groupId: 'g1@chatroom',
     groupAvatar: 'https://example.com/g.jpg',
     ownerId: 'u1',
+    sourceSessionId: 'source-session',
   },
   members: [
     {
@@ -130,6 +131,7 @@ describe('chatlab native parser parity', { skip: !nativeAvailable() && 'native m
     assert.equal(nativeResult.meta.platform, 'weixin')
     assert.equal(nativeResult.meta.groupId, 'g1@chatroom')
     assert.equal(nativeResult.meta.ownerId, 'u1')
+    assert.equal(nativeResult.meta.sourceSessionId, 'source-session')
     assert.equal(nativeResult.members.length, 2)
     assert.deepEqual(nativeResult.members[0].aliases, ['Ally'])
     assert.equal(nativeResult.members[0].avatar, 'https://example.com/a.jpg')
diff --git a/packages/parser/src/native/chatlab-native.ts b/packages/parser/src/native/chatlab-native.ts
index 4c14f816..18dbfee7 100644
--- a/packages/parser/src/native/chatlab-native.ts
+++ b/packages/parser/src/native/chatlab-native.ts
@@ -21,6 +21,7 @@ interface ChatlabMetaJson {
   groupId: string | null
   groupAvatar: string | null
   ownerId: string | null
+  sourceSessionId: string | null
   /**
    * true when members came from the top-level `members` array;
    * false when collected from messages (TS emits different object shapes).
@@ -62,6 +63,7 @@ const chatlabAdapter: NativeFormatAdapter = {
       groupId: meta.groupId ?? undefined,
       groupAvatar: meta.groupAvatar ?? undefined,
       ownerId: meta.ownerId ?? undefined,
+      sourceSessionId: meta.sourceSessionId ?? undefined,
     }
   },
 
diff --git a/packages/parser/src/types.ts b/packages/parser/src/types.ts
index 3ce80bb8..436faccb 100644
--- a/packages/parser/src/types.ts
+++ b/packages/parser/src/types.ts
@@ -17,6 +17,7 @@ export interface ParsedMeta {
   groupId?: string // 群ID（群聊类型有值）
   groupAvatar?: string // 群头像（base64 Data URL）
   ownerId?: string // 所有者/导出者的 platformId
+  sourceSessionId?: string // ChatLab 导出来源会话 ID，仅用于安全消歧
 }
 
 /**
diff --git a/src/services/import/types.ts b/src/services/import/types.ts
index c8b51c6b..e9d3e547 100644
--- a/src/services/import/types.ts
+++ b/src/services/import/types.ts
@@ -17,7 +17,7 @@ export interface ImportOptions {
 // ==================== 导入结果 ====================
 
 export type AutoImportMode = 'created' | 'incremental'
-export type AutoImportMatchMethod = 'stable-id' | 'trailing-messages'
+export type AutoImportMatchMethod = 'source-session-id' | 'stable-id' | 'trailing-messages'
 
 export interface ImportResult {
   success: boolean
diff --git a/src/types/format.ts b/src/types/format.ts
index ab4068f4..d4526a4a 100644
--- a/src/types/format.ts
+++ b/src/types/format.ts
@@ -37,6 +37,7 @@ export interface ChatLabMeta {
   groupId?: string // 群ID（可选，仅群聊）
   groupAvatar?: string // 群头像（base64 Data URL，可选）
   ownerId?: string // 所有者/导出者的 platformId（可选）
+  sourceSessionId?: string // ChatLab 导出来源会话 ID（可选）
 }
 
 /**
diff --git a/tests/chatlab-json-export-roundtrip.test.ts b/tests/chatlab-json-export-roundtrip.test.ts
index c955b68a..e85ef2d0 100644
--- a/tests/chatlab-json-export-roundtrip.test.ts
+++ b/tests/chatlab-json-export-roundtrip.test.ts
@@ -62,6 +62,7 @@ test('exports JSON as ChatLab format that can be parsed for re-import', async ()
     const exported = JSON.parse(result.content)
     assert.equal(exported.chatlab.version, '0.0.2')
     assert.equal(exported.meta.ownerId, 'alice')
+    assert.equal(exported.meta.sourceSessionId, 'session-1')
     assert.deepEqual(exported.members[0].aliases, ['Alice'])
     assert.deepEqual(
       exported.messages.map((message: { timestamp: number }) => message.timestamp),
@@ -87,6 +88,7 @@ test('exports JSON as ChatLab format that can be parsed for re-import', async ()
       groupId: 'group-1',
       groupAvatar: 'group-avatar',
       ownerId: 'alice',
+      sourceSessionId: 'session-1',
     })
     assert.deepEqual(
       parsed.members.map((member) => ({