diff --git a/src/content/market/favorites-import.ts b/src/content/market/favorites-import.ts
new file mode 100644
index 0000000..18cbe55
--- /dev/null
+++ b/src/content/market/favorites-import.ts
@@ -0,0 +1,17 @@
+import type { FavoriteCreator } from "./favorites-store";
+import type { MarketRecord } from "./types";
+
+export function toFavoriteMarketRecords(creators: FavoriteCreator[]): MarketRecord[] {
+  const byAuthorId = new Map<string, FavoriteCreator>();
+  creators.forEach((creator) => {
+    if (creator.authorId && !byAuthorId.has(creator.authorId)) {
+      byAuthorId.set(creator.authorId, creator);
+    }
+  });
+  return Array.from(byAuthorId.values()).map((creator) => ({
+    authorId: creator.authorId,
+    authorName: creator.authorName,
+    ...(creator.coreUserId ? { coreUserId: creator.coreUserId } : {}),
+    status: "idle" as const
+  }));
+}
diff --git a/tests/favorites-import.test.ts b/tests/favorites-import.test.ts
new file mode 100644
index 0000000..2db2790
--- /dev/null
+++ b/tests/favorites-import.test.ts
@@ -0,0 +1,76 @@
+import { describe, expect, test } from "vitest";
+
+import { toFavoriteMarketRecords } from "../src/content/market/favorites-import";
+
+describe("favorites-import", () => {
+  test("returns no records for an empty favorites list", () => {
+    expect(toFavoriteMarketRecords([])).toEqual([]);
+  });
+
+  test("preserves a creator core user id for later batch payload mapping", () => {
+    expect(
+      toFavoriteMarketRecords([
+        {
+          authorId: "author-1",
+          authorName: "达人A",
+          coreUserId: "core-1",
+          savedAt: "2026-07-17T00:00:00.000Z"
+        }
+      ])
+    ).toEqual([
+      {
+        authorId: "author-1",
+        authorName: "达人A",
+        coreUserId: "core-1",
+        status: "idle"
+      }
+    ]);
+  });
+
+  test("keeps the first creator for each author id in first-occurrence order", () => {
+    expect(
+      toFavoriteMarketRecords([
+        {
+          authorId: "author-2",
+          authorName: "达人B",
+          savedAt: "2026-07-17T00:00:00.000Z"
+        },
+        {
+          authorId: "author-1",
+          authorName: "达人A",
+          savedAt: "2026-07-17T00:00:01.000Z"
+        },
+        {
+          authorId: "author-2",
+          authorName: "达人B更新",
+          coreUserId: "core-2",
+          savedAt: "2026-07-17T00:00:02.000Z"
+        }
+      ])
+    ).toEqual([
+      { authorId: "author-2", authorName: "达人B", status: "idle" },
+      { authorId: "author-1", authorName: "达人A", status: "idle" }
+    ]);
+  });
+
+  test("returns only the minimal idle market record fields", () => {
+    const [record] = toFavoriteMarketRecords([
+      {
+        authorId: "author-1",
+        authorName: "达人A",
+        savedAt: "2026-07-17T00:00:00.000Z"
+      }
+    ]);
+
+    expect(record).toEqual({
+      authorId: "author-1",
+      authorName: "达人A",
+      status: "idle"
+    });
+    expect(Object.keys(record ?? {})).toEqual([
+      "authorId",
+      "authorName",
+      "status"
+    ]);
+  });
+});