diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index a4901f27..2b48a6b8 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -254,6 +254,17 @@ export {
 } from './ai'
 export type { StreamParserEvent, ThinkingLevel, ThinkingCompat } from './ai'
 
+// Owner profile matching（跨会话"我是谁"识别）
+export {
+  NAME_MATCH_PLATFORMS,
+  isNameMatchPlatform,
+  normalizeOwnerName,
+  collectCandidateNames,
+  mergeConfirmedNames,
+  matchOwnerProfile,
+} from './owner'
+export type { OwnerMatchCandidate, OwnerMatchResult } from './owner'
+
 // Import utilities
 export { generateMessageKey, buildMemberIdMap } from './import'
 
diff --git a/packages/core/src/owner/index.ts b/packages/core/src/owner/index.ts
new file mode 100644
index 00000000..4138f1d8
--- /dev/null
+++ b/packages/core/src/owner/index.ts
@@ -0,0 +1,9 @@
+export {
+  NAME_MATCH_PLATFORMS,
+  isNameMatchPlatform,
+  normalizeOwnerName,
+  collectCandidateNames,
+  mergeConfirmedNames,
+  matchOwnerProfile,
+} from './owner-matching'
+export type { OwnerMatchCandidate, OwnerMatchResult } from './owner-matching'
diff --git a/packages/core/src/owner/owner-matching.test.ts b/packages/core/src/owner/owner-matching.test.ts
new file mode 100644
index 00000000..12be6703
--- /dev/null
+++ b/packages/core/src/owner/owner-matching.test.ts
@@ -0,0 +1,174 @@
+/**
+ * Unit tests for owner profile matching (deterministic "who am I" resolution).
+ *
+ * Run: npx tsx --test packages/core/src/owner/owner-matching.test.ts
+ */
+
+import { describe, it } from 'node:test'
+import assert from 'node:assert/strict'
+import type { OwnerProfile } from '@openchatlab/shared-types'
+import {
+  normalizeOwnerName,
+  collectCandidateNames,
+  mergeConfirmedNames,
+  matchOwnerProfile,
+  isNameMatchPlatform,
+} from './owner-matching'
+
+function makeProfile(overrides?: Partial<OwnerProfile>): OwnerProfile {
+  return {
+    platformId: 'Alice',
+    displayName: 'Alice',
+    confirmedNames: ['Alice'],
+    matchMode: 'name',
+    updatedAt: 1700000000,
+    ...overrides,
+  }
+}
+
+describe('normalizeOwnerName', () => {
+  it('trims and collapses whitespace', () => {
+    assert.equal(normalizeOwnerName('  Alice   Smith  '), 'alice smith')
+  })
+
+  it('removes invisible direction/control characters (LRM/RLM/zero-width/BOM)', () => {
+    assert.equal(normalizeOwnerName('\u200EAlice\u200F'), 'alice')
+    assert.equal(normalizeOwnerName('\u202AAlice\u202C'), 'alice')
+    assert.equal(normalizeOwnerName('A\u200Blice'), 'alice')
+    assert.equal(normalizeOwnerName('\uFEFFAlice'), 'alice')
+  })
+
+  it('applies NFKC normalization (full-width to half-width)', () => {
+    assert.equal(normalizeOwnerName('Ａｌｉｃｅ　１２３'), 'alice 123')
+  })
+
+  it('lowercases for case-insensitive comparison', () => {
+    assert.equal(normalizeOwnerName('ALICE'), 'alice')
+  })
+
+  it('keeps CJK names intact', () => {
+    assert.equal(normalizeOwnerName(' 王小明 '), '王小明')
+  })
+})
+
+describe('collectCandidateNames', () => {
+  it('collects platformId, accountName, groupNickname, aliases and displayName', () => {
+    const names = collectCandidateNames({
+      platformId: 'u001',
+      accountName: 'Alice',
+      groupNickname: 'Ali',
+      aliases: ['A.', 'Allie'],
+      displayName: 'Ali',
+    })
+    assert.deepEqual(names, ['u001', 'Alice', 'Ali', 'A.', 'Allie'])
+  })
+
+  it('skips empty and whitespace-only values', () => {
+    const names = collectCandidateNames({
+      platformId: 'u001',
+      accountName: '',
+      groupNickname: '   ',
+      aliases: [''],
+      displayName: null,
+    })
+    assert.deepEqual(names, ['u001'])
+  })
+})
+
+describe('mergeConfirmedNames', () => {
+  it('merges member names into existing list without duplicates, preserving order', () => {
+    const merged = mergeConfirmedNames(['Alice', 'Ali'], {
+      platformId: 'Alice',
+      accountName: 'Alice Smith',
+      groupNickname: 'Ali',
+      aliases: ['Allie'],
+    })
+    assert.deepEqual(merged, ['Alice', 'Ali', 'Alice Smith', 'Allie'])
+  })
+
+  it('keeps original strings without normalization', () => {
+    const merged = mergeConfirmedNames([], { platformId: ' Alice ' })
+    assert.deepEqual(merged, [' Alice '])
+  })
+})
+
+describe('matchOwnerProfile', () => {
+  it('matches exact platformId on any platform', () => {
+    const result = matchOwnerProfile('weixin', makeProfile({ platformId: 'wx_123', confirmedNames: [] }), [
+      { platformId: 'wx_123', accountName: 'Me' },
+      { platformId: 'wx_456', accountName: 'Other' },
+    ])
+    assert.deepEqual(result, { type: 'exact', platformId: 'wx_123' })
+  })
+
+  it('falls back to name matching only on allowlisted platforms', () => {
+    const members = [
+      { platformId: 'Alice Smith', accountName: 'Alice Smith' },
+      { platformId: 'Bob', accountName: 'Bob' },
+    ]
+    const profile = makeProfile({ platformId: 'Alice', confirmedNames: ['alice  smith'] })
+
+    assert.deepEqual(matchOwnerProfile('whatsapp', profile, members), {
+      type: 'name',
+      platformId: 'Alice Smith',
+    })
+    // weixin has stable IDs; no name fallback
+    assert.deepEqual(matchOwnerProfile('weixin', profile, members), { type: 'none' })
+    // unknown platform never uses name fallback
+    assert.deepEqual(matchOwnerProfile('unknown', profile, members), { type: 'none' })
+  })
+
+  it('matches names with invisible characters and width differences', () => {
+    const result = matchOwnerProfile('whatsapp', makeProfile({ confirmedNames: ['Ａｌｉｃｅ'] }), [
+      { platformId: '\u200EAlice\u200F' },
+      { platformId: 'Bob' },
+    ])
+    assert.deepEqual(result, { type: 'name', platformId: '\u200EAlice\u200F' })
+  })
+
+  it('matches via aliases and groupNickname', () => {
+    const result = matchOwnerProfile('line', makeProfile({ platformId: 'Allie W', confirmedNames: ['Allie'] }), [
+      { platformId: 'Alice', accountName: 'Alice', aliases: ['Allie'] },
+      { platformId: 'Bob' },
+    ])
+    assert.deepEqual(result, { type: 'name', platformId: 'Alice' })
+  })
+
+  it('returns ambiguous when multiple members match', () => {
+    const result = matchOwnerProfile('whatsapp', makeProfile({ confirmedNames: ['Alice'] }), [
+      { platformId: 'u1', accountName: 'Alice' },
+      { platformId: 'u2', groupNickname: 'Alice' },
+    ])
+    assert.equal(result.type, 'ambiguous')
+    assert.deepEqual(result.type === 'ambiguous' ? result.platformIds : [], ['u1', 'u2'])
+  })
+
+  it('returns none when nothing matches or confirmed names are empty', () => {
+    const members = [{ platformId: 'Bob' }]
+    assert.deepEqual(matchOwnerProfile('whatsapp', makeProfile({ confirmedNames: ['Alice'] }), members), {
+      type: 'none',
+    })
+    assert.deepEqual(matchOwnerProfile('whatsapp', makeProfile({ confirmedNames: ['  '] }), members), {
+      type: 'none',
+    })
+  })
+
+  it('does not use substring containment', () => {
+    const result = matchOwnerProfile('whatsapp', makeProfile({ confirmedNames: ['Alice'] }), [
+      { platformId: 'Alice Smith' },
+    ])
+    assert.deepEqual(result, { type: 'none' })
+  })
+})
+
+describe('isNameMatchPlatform', () => {
+  it('only allows whatsapp, line and instagram', () => {
+    assert.equal(isNameMatchPlatform('whatsapp'), true)
+    assert.equal(isNameMatchPlatform('line'), true)
+    assert.equal(isNameMatchPlatform('instagram'), true)
+    assert.equal(isNameMatchPlatform('weixin'), false)
+    assert.equal(isNameMatchPlatform('qq'), false)
+    assert.equal(isNameMatchPlatform('telegram'), false)
+    assert.equal(isNameMatchPlatform('unknown'), false)
+  })
+})
diff --git a/packages/core/src/owner/owner-matching.ts b/packages/core/src/owner/owner-matching.ts
new file mode 100644
index 00000000..964b57ee
--- /dev/null
+++ b/packages/core/src/owner/owner-matching.ts
@@ -0,0 +1,127 @@
+/**
+ * Owner profile matching — platform-independent "who am I" resolution.
+ *
+ * Given a platform-level owner profile (stored in preferences) and the member
+ * list of a session, decide which member is the owner. Matching is strictly
+ * deterministic: exact platformId first, then normalized-name equality for an
+ * allowlisted set of platforms whose exports lack stable native IDs.
+ * No fuzzy matching, no heuristics, no LLM inference.
+ */
+
+import type { OwnerProfile } from '@openchatlab/shared-types'
+
+/**
+ * Platforms whose text exports use display names as platformId, so a
+ * normalized-name fallback is safe and necessary. All other platforms
+ * (including 'unknown') match by exact platformId only.
+ */
+export const NAME_MATCH_PLATFORMS: ReadonlySet<string> = new Set(['whatsapp', 'line', 'instagram'])
+
+export function isNameMatchPlatform(platform: string): boolean {
+  return NAME_MATCH_PLATFORMS.has(platform)
+}
+
+/** Minimal member shape needed for owner matching. */
+export interface OwnerMatchCandidate {
+  platformId: string
+  accountName?: string | null
+  groupNickname?: string | null
+  aliases?: string[] | null
+  /** Computed display name, if the caller already derived one. */
+  displayName?: string | null
+}
+
+export type OwnerMatchResult =
+  | { type: 'exact'; platformId: string }
+  | { type: 'name'; platformId: string }
+  | { type: 'none' }
+  | { type: 'ambiguous'; platformIds: string[] }
+
+// Invisible direction/control characters that chat exports commonly embed
+// around names (LRM/RLM, directional embeddings/isolates, zero-width chars, BOM).
+const INVISIBLE_CHARS_RE = /[\u200B-\u200F\u202A-\u202E\u2060-\u2064\u2066-\u2069\uFEFF]/g
+
+/**
+ * Deterministic name normalization for matching:
+ * strip invisible chars → NFKC → collapse whitespace → trim → lowercase.
+ * Stored names keep their original form; normalize only at compare time.
+ */
+export function normalizeOwnerName(name: string): string {
+  return name.replace(INVISIBLE_CHARS_RE, '').normalize('NFKC').replace(/\s+/g, ' ').trim().toLowerCase()
+}
+
+/** Collect all candidate name strings of a member (original, non-normalized, deduped, non-empty). */
+export function collectCandidateNames(member: OwnerMatchCandidate): string[] {
+  const names = [
+    member.platformId,
+    member.accountName ?? '',
+    member.groupNickname ?? '',
+    ...(member.aliases ?? []),
+    member.displayName ?? '',
+  ]
+  const result: string[] = []
+  const seen = new Set<string>()
+  for (const name of names) {
+    if (!name || !name.trim()) continue
+    if (seen.has(name)) continue
+    seen.add(name)
+    result.push(name)
+  }
+  return result
+}
+
+/**
+ * Merge a member's candidate names into an existing confirmedNames list.
+ * Keeps original strings; dedupes by exact string equality, preserving order.
+ */
+export function mergeConfirmedNames(existing: string[], member: OwnerMatchCandidate): string[] {
+  const result: string[] = []
+  const seen = new Set<string>()
+  for (const name of [...existing, ...collectCandidateNames(member)]) {
+    if (!name || !name.trim()) continue
+    if (seen.has(name)) continue
+    seen.add(name)
+    result.push(name)
+  }
+  return result
+}
+
+/**
+ * Match a platform owner profile against a session's members.
+ *
+ * 1. Exact platformId match wins immediately.
+ * 2. Name fallback only for NAME_MATCH_PLATFORMS: a member matches when any
+ *    of its normalized candidate names equals any normalized confirmed name.
+ * 3. Exactly one member must match; zero → none, multiple → ambiguous.
+ */
+export function matchOwnerProfile(
+  platform: string,
+  profile: OwnerProfile,
+  members: OwnerMatchCandidate[]
+): OwnerMatchResult {
+  const exact = members.find((m) => m.platformId === profile.platformId)
+  if (exact) {
+    return { type: 'exact', platformId: exact.platformId }
+  }
+
+  if (!isNameMatchPlatform(platform)) {
+    return { type: 'none' }
+  }
+
+  const confirmed = new Set(profile.confirmedNames.map(normalizeOwnerName).filter((n) => n.length > 0))
+  if (confirmed.size === 0) {
+    return { type: 'none' }
+  }
+
+  const matched = members.filter((m) =>
+    collectCandidateNames(m).some((name) => confirmed.has(normalizeOwnerName(name)))
+  )
+
+  if (matched.length === 1) {
+    return { type: 'name', platformId: matched[0].platformId }
+  }
+  if (matched.length > 1) {
+    return { type: 'ambiguous', platformIds: matched.map((m) => m.platformId) }
+  }
+  return { type: 'none' }
+}
diff --git a/packages/node-runtime/src/preferences.ts b/packages/node-runtime/src/preferences.ts
index c9605bf0..e612c109 100644
--- a/packages/node-runtime/src/preferences.ts
+++ b/packages/node-runtime/src/preferences.ts
@@ -68,6 +68,8 @@ const DEFAULTS: Preferences = {
   },
   filterHistory: [],
   thinkingLevels: {},
+  ownerProfilesByPlatform: {},
+  ownerPromptDismissedSessionIds: [],
 }
 
 export class PreferencesManager {
@@ -152,6 +154,8 @@ export class PreferencesManager {
       wordFilter: partial.wordFilter ? { ...DEFAULTS.wordFilter, ...partial.wordFilter } : { ...DEFAULTS.wordFilter },
       filterHistory: partial.filterHistory ?? DEFAULTS.filterHistory,
       thinkingLevels: partial.thinkingLevels ?? DEFAULTS.thinkingLevels,
+      ownerProfilesByPlatform: partial.ownerProfilesByPlatform ?? DEFAULTS.ownerProfilesByPlatform,
+      ownerPromptDismissedSessionIds: partial.ownerPromptDismissedSessionIds ?? DEFAULTS.ownerPromptDismissedSessionIds,
     }
   }
 
diff --git a/packages/shared-types/index.ts b/packages/shared-types/index.ts
index 31cdf138..2335984a 100644
--- a/packages/shared-types/index.ts
+++ b/packages/shared-types/index.ts
@@ -185,6 +185,39 @@ export interface FilterHistoryItem {
   selectedSessionIds?: number[]
 }
 
+export type OwnerMatchMode = 'platform_id' | 'name'
+
+/**
+ * Platform-level owner identity ("who am I" on this chat platform).
+ * Stored in preferences.json and shared across sessions of the same platform.
+ */
+export interface OwnerProfile {
+  platformId: string
+  displayName: string
+  /** Original (non-normalized) names confirmed by the user; normalization happens at match time. */
+  confirmedNames: string[]
+  matchMode: OwnerMatchMode
+  updatedAt: number
+}
+
+export type ApplyOwnerProfileReason = 'no_profile' | 'no_match' | 'ambiguous' | 'already_set' | 'missing_session'
+
+export interface ApplyOwnerProfileResult {
+  applied: boolean
+  ownerId?: string
+  reason?: ApplyOwnerProfileReason
+  /** Whether the user chose "do not remind me" for this session (UI hint only). */
+  dismissed: boolean
+}
+
+export interface SetOwnerAndApplyProfileResult {
+  sessionId: string
+  platform: string
+  ownerId: string
+  /** Other same-platform sessions auto-filled by the updated profile. */
+  updatedSessionIds: string[]
+}
+
 export interface Preferences {
   pinnedSessionIds: string[]
   aiPreprocessConfig: AIPreprocessConfig
@@ -199,6 +232,10 @@ export interface Preferences {
   filterHistory: FilterHistoryItem[]
   /** Per-model thinking level, keyed by `${configId}:${modelId}`. */
   thinkingLevels: Record<string, string>
+  /** Platform-level owner identity, keyed by platform (e.g. 'whatsapp'). */
+  ownerProfilesByPlatform: Record<string, OwnerProfile>
+  /** Sessions where the user chose "do not remind me"; suppresses the owner prompt UI only. */
+  ownerPromptDismissedSessionIds: string[]
 }
 
 export interface UiConfig {