diff --git a/src/pystatpower/basic.py b/src/pystatpower/basic.py
index 530af88..75dda13 100644
--- a/src/pystatpower/basic.py
+++ b/src/pystatpower/basic.py
@@ -1,3 +1,4 @@
+from enum import Enum, EnumMeta
 from math import ceil, floor, inf, isclose, trunc
 from numbers import Real
 
@@ -92,6 +93,7 @@ def pseudo_bound(self, eps: Real = 1e-10) -> tuple[Real, Real]:
 
 
 class PowerAnalysisNumeric(Real):
+    """自定义功效分析数值类型"""
 
     _domain = Interval(-inf, inf, lower_inclusive=True, upper_inclusive=True)
 
@@ -242,6 +244,16 @@ def __bool__(self):
         return bool(self._value)
 
 
+class PowerAnalysisOption(EnumMeta):
+    """自定义功效分析选项的枚举元类，用于支持大小写不敏感的枚举值访问。"""
+
+    def __getitem__(self, name):
+        if isinstance(name, str):
+            return super().__getitem__(name.upper())
+        else:
+            return super().__getitem__(name)
+
+
 class Alpha(PowerAnalysisNumeric):
     """显著性水平"""
 
diff --git a/tests/test_basic.py b/tests/test_basic.py
index dcb98ce..9cecd79 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -316,6 +316,23 @@ def test_bool(self):
         assert bool(PowerAnalysisNumeric(-inf)) == bool(-inf)
 
 
+class TestPowerAnalysisOption:
+    def test_getitem(self):
+        class TestEnum(Enum, metaclass=PowerAnalysisOption):
+            A = 1
+            B = 2
+
+        assert TestEnum["A"] == TestEnum.A
+        assert TestEnum["a"] == TestEnum.A
+        assert TestEnum["B"] == TestEnum.B
+        assert TestEnum["b"] == TestEnum.B
+
+        with pytest.raises(KeyError):
+            TestEnum["C"]
+        with pytest.raises(KeyError):
+            TestEnum[TestEnum.A]
+
+
 def test_alpha():
     assert Alpha(0.05) == 0.05