diff --git a/server/manifest/config/config.example.yaml b/server/manifest/config/config.example.yaml
index baefc67..70f5dca 100644
--- a/server/manifest/config/config.example.yaml
+++ b/server/manifest/config/config.example.yaml
@@ -195,6 +195,8 @@ token:
 # 业务敏感字段保护。生产环境必须替换为独立的高强度密钥，并通过密钥管理系统注入。
 security:
   dataKey: "change-me-before-production"
+  # 迁移前的 HotGo dataKey，仅用于兼容读取，不能删除仍有存量密文使用的密钥。
+  legacyDataKeys: []
   # 与 C 端收款资料使用相同配置；历史主密钥只用于读取，不修改原密文。
   financeMasterKey: ""
   financeLegacyMasterKeys: []
diff --git a/server/utility/encrypt/field.go b/server/utility/encrypt/field.go
index 794ba7c..d9e2e21 100644
--- a/server/utility/encrypt/field.go
+++ b/server/utility/encrypt/field.go
@@ -65,6 +65,13 @@ func DecryptField(ctx context.Context, encoded string) (string, error) {
 	if key, keyErr := fieldKey(ctx); keyErr == nil {
 		keys = append(keys, key)
 	}
+	// Imported HotGo records can use an older dataKey; never use these keys for new writes.
+	for _, secret := range g.Cfg().MustGet(ctx, "security.legacyDataKeys", []string{}).Strings() {
+		if secret = strings.TrimSpace(secret); secret != "" {
+			sum := sha256.Sum256([]byte(secret))
+			keys = append(keys, sum[:])
+		}
+	}
 	for _, key := range keys {
 		block, keyErr := aes.NewCipher(key)
 		if keyErr != nil {
diff --git a/server/utility/encrypt/finance_field_test.go b/server/utility/encrypt/finance_field_test.go
index 774ee22..c0e2068 100644
--- a/server/utility/encrypt/finance_field_test.go
+++ b/server/utility/encrypt/finance_field_test.go
@@ -81,6 +81,28 @@ func TestDecryptFieldKeepsLegacyHotGoDataReadable(t *testing.T) {
 	}
 }
 
+func TestDecryptFieldReadsImportedHotGoKeyWithoutChangingCurrentKey(t *testing.T) {
+	ctx := context.Background()
+	setFieldTestConfig(t, map[string]interface{}{"dataKey": "imported-original-data-key"})
+	encoded, err := EncryptField(ctx, "迁移前的资料")
+	if err != nil {
+		t.Fatal(err)
+	}
+	setFieldTestConfig(t, map[string]interface{}{"dataKey": "current-data-key", "legacyDataKeys": []string{"imported-original-data-key"}, "financeMasterKey": "current-finance-master-key-with-at-least-32-characters"})
+	plain, err := DecryptField(ctx, encoded)
+	if err != nil || plain != "迁移前的资料" {
+		t.Fatalf("imported record unreadable: %v", err)
+	}
+	current, err := EncryptField(ctx, "当前资料")
+	if err != nil {
+		t.Fatal(err)
+	}
+	plain, err = DecryptField(ctx, current)
+	if err != nil || plain != "当前资料" {
+		t.Fatalf("current key was not preserved: %v", err)
+	}
+}
+
 func setFieldTestConfig(t *testing.T, security map[string]interface{}) {
 	t.Helper()
 	data, err := json.Marshal(map[string]interface{}{"security": security})