diff --git a/qlib/utils/paral.py b/qlib/utils/paral.py
index a6177833413..320f49c19d2 100644
--- a/qlib/utils/paral.py
+++ b/qlib/utils/paral.py
@@ -6,7 +6,6 @@
 from threading import Thread
 from typing import Callable, Text, Union
 
-import joblib
 from joblib import Parallel, delayed
 from joblib._parallel_backends import MultiprocessingBackend
 import pandas as pd
@@ -22,12 +21,7 @@ def __init__(self, *args, **kwargs):
         maxtasksperchild = kwargs.pop("maxtasksperchild", None)
         super(ParallelExt, self).__init__(*args, **kwargs)
         if isinstance(self._backend, MultiprocessingBackend):
-            # 2025-05-04 joblib released version 1.5.0, in which _backend_args was removed and replaced by _backend_kwargs.
-            # Ref: https://github.com/joblib/joblib/pull/1525/files#diff-e4dff8042ce45b443faf49605b75a58df35b8c195978d4a57f4afa695b406bdc
-            if joblib.__version__ < "1.5.0":
-                self._backend_args["maxtasksperchild"] = maxtasksperchild  # pylint: disable=E1101
-            else:
-                self._backend_kwargs["maxtasksperchild"] = maxtasksperchild  # pylint: disable=E1101
+            self._backend_kwargs["maxtasksperchild"] = maxtasksperchild  # pylint: disable=E1101
 
 
 def datetime_groupby_apply(
diff --git a/tests/test_parallel_ext.py b/tests/test_parallel_ext.py
new file mode 100644
index 00000000000..30ecb95e021
--- /dev/null
+++ b/tests/test_parallel_ext.py
@@ -0,0 +1,22 @@
+"""Test for Issue #1927: ParallelExt _backend_kwargs attribute fix."""
+import pytest
+from joblib import delayed
+from qlib.utils.paral import ParallelExt
+
+
+def test_parallel_ext_with_maxtasksperchild():
+    """ParallelExt should accept maxtasksperchild without AttributeError."""
+    p = ParallelExt(n_jobs=1, backend="loky", maxtasksperchild=10)
+    results = p(delayed(lambda x: x * 2)(i) for i in range(5))
+    assert results == [0, 2, 4, 6, 8]
+
+
+def test_parallel_ext_without_maxtasksperchild():
+    """ParallelExt should work normally without maxtasksperchild."""
+    p = ParallelExt(n_jobs=1)
+    results = p(delayed(sum)([i, 1]) for i in range(3))
+    assert results == [1, 2, 3]
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])