diff --git a/python/pyfory/tests/test_util.py b/python/pyfory/tests/test_util.py
new file mode 100644
index 0000000000..7da7e4a302
--- /dev/null
+++ b/python/pyfory/tests/test_util.py
@@ -0,0 +1,12 @@
+import sys
+
+from pyfory.util import is_little_endian, is_big_endian
+
+
+def test_endian_flags():
+    # 验证 is_little_endian 与 is_big_endian 与系统字节序一致
+    assert is_little_endian == (sys.byteorder == "little")
+    assert is_big_endian == (sys.byteorder == "big")
+    # 两者应当互斥
+    assert is_little_endian != is_big_endian
+
diff --git a/python/pyfory/util.py b/python/pyfory/util.py
index ea0865c9b7..2890077bdf 100644
--- a/python/pyfory/util.py
+++ b/python/pyfory/util.py
@@ -83,6 +83,8 @@ def __call__(self, *_args, **_kwargs):
 
 
 is_little_endian = sys.byteorder == "little"
+# 新增的大端序标记，便于调用方直接判断当前平台是否为大端序
+is_big_endian = sys.byteorder == "big"
 
 
 __all__ = [
@@ -92,4 +94,5 @@ def __call__(self, *_args, **_kwargs):
     "set_bit_to",
     "lazy_import",
     "is_little_endian",
+    "is_big_endian",
 ]