diff --git a/src/quant_platform_kit/common/notification_localization.py b/src/quant_platform_kit/common/notification_localization.py
index 755f37c..3f34194 100644
--- a/src/quant_platform_kit/common/notification_localization.py
+++ b/src/quant_platform_kit/common/notification_localization.py
@@ -8,14 +8,8 @@
 
 PRICE_SOURCE_LABELS: dict[str, tuple[str, str]] = {
     "longbridge_candlesticks": ("LongBridge 日线K线", "LongBridge daily candlesticks"),
-    "schwab_daily_history_with_live_quote_overlay": (
-        "Schwab 日线历史 + 实时报价覆盖",
-        "Schwab daily history + live quote overlay",
-    ),
-    "firstrade_ohlc_with_live_quote_overlay": (
-        "Firstrade OHLC + 实时报价覆盖",
-        "Firstrade OHLC + live quote overlay",
-    ),
+    "schwab_daily_history_with_live_quote_overlay": ("Schwab 日线历史", "Schwab daily history"),
+    "firstrade_ohlc_with_live_quote_overlay": ("Firstrade OHLC", "Firstrade OHLC"),
     "market_quote": ("实时行情报价", "market quote"),
     "mixed_market_quote_snapshot_close": (
         "实时行情报价 + 快照收盘价回补",
@@ -129,20 +123,6 @@ def localize_price_source_label(
     return source.replace("_", " ")
 
 
-def localize_quote_overlay_state(
-    value: object,
-    *,
-    translator: NotificationTranslator | None = None,
-    locale: str | None = None,
-) -> str:
-    use_zh = translator_uses_zh(translator) if translator is not None else locale_uses_zh(locale)
-    if value is True:
-        return "是" if use_zh else "yes"
-    if value is False:
-        return "否" if use_zh else "no"
-    return "未知" if use_zh else "unknown"
-
-
 def localize_notification_text(
     text: object,
     *,
diff --git a/tests/test_notification_localization.py b/tests/test_notification_localization.py
index 4cb5b7e..91e721d 100644
--- a/tests/test_notification_localization.py
+++ b/tests/test_notification_localization.py
@@ -5,7 +5,6 @@
 from quant_platform_kit.common.notification_localization import (
     COMMON_ZH_NOTIFICATION_REPLACEMENTS,
     localize_price_source_label,
-    localize_quote_overlay_state,
     localize_notification_text,
     translator_uses_zh,
 )
@@ -64,7 +63,7 @@ def test_localize_price_source_label_supports_broker_sources(self):
                 "schwab_daily_history_with_live_quote_overlay",
                 translator=_translator_factory("无需交易"),
             ),
-            "Schwab 日线历史 + 实时报价覆盖",
+            "Schwab 日线历史",
         )
         self.assertEqual(
             localize_price_source_label(
@@ -74,11 +73,6 @@ def test_localize_price_source_label_supports_broker_sources(self):
             "LongBridge daily candlesticks",
         )
 
-    def test_localize_quote_overlay_state_supports_locale_without_translator(self):
-        self.assertEqual(localize_quote_overlay_state(True, locale="zh-CN"), "是")
-        self.assertEqual(localize_quote_overlay_state(False, locale="en-US"), "no")
-        self.assertEqual(localize_quote_overlay_state(None, locale="zh"), "未知")
-
 
 if __name__ == "__main__":
     unittest.main()