diff --git a/tests/backtest/test_cta_engine.py b/tests/backtest/test_cta_engine.py
index 468de11..7ca012c 100644
--- a/tests/backtest/test_cta_engine.py
+++ b/tests/backtest/test_cta_engine.py
@@ -2,6 +2,16 @@
 # Mock vnpy and tzlocal modules before importing anything that depends on them
 import sys
 from unittest.mock import MagicMock
+
+# Mock vnpy/tzlocal/empyrical BEFORE importing cta_engine (which imports them at top).
+# Save originals so we can RESTORE after this module — otherwise the global sys.modules
+# pollution breaks every later test that imports real vnpy/empyrical (datareader/spike/factor/metrics).
+_MOCKED_KEYS = (
+    "tzlocal", "vnpy.trader.setting", "vnpy.trader.constant", "vnpy.trader.object",
+    "vnpy.trader.database", "vnpy_ctastrategy.backtesting", "empyrical",
+)
+_SAVED_MODULES = {k: sys.modules.get(k) for k in _MOCKED_KEYS}
+
 mock_tzlocal = MagicMock()
 mock_tzlocal.get_localzone_name = MagicMock(return_value="UTC")
 sys.modules["tzlocal"] = mock_tzlocal
@@ -21,6 +31,22 @@ import pandas as pd
 from sanguo_backtest.cta_engine import run_cta_backtest
 
 
+@pytest.fixture(scope="module", autouse=True)
+def _restore_modules_after():
+    """Restore sys.modules after this module's tests, so downstream tests import the
+    REAL vnpy/empyrical instead of the mocks we installed above. Also drop cta_engine/
+    metrics from the module cache (they were imported while mocks were active) so they
+    re-import fresh with real dependencies."""
+    yield
+    for cached in ("sanguo_backtest.cta_engine", "sanguo_backtest.metrics"):
+        sys.modules.pop(cached, None)
+    for k, orig in _SAVED_MODULES.items():
+        if orig is None:
+            sys.modules.pop(k, None)
+        else:
+            sys.modules[k] = orig
+
+
 class TestRunCtaBacktest:
     """Test suite for run_cta_backtest function."""