diff --git a/Math/BIAS.py b/Math/BIAS.py
new file mode 100644
index 000000000..94cedf870
--- /dev/null
+++ b/Math/BIAS.py
@@ -0,0 +1,36 @@
+class BIAS_Item:
+    def __init__(self, bias1, bias2, bias3):
+        self.bias1 = bias1
+        self.bias2 = bias2
+        self.bias3 = bias3
+
+
+class BIAS:
+    def __init__(self, fastperiod=6, midperiod=12, slowperiod=24):
+        self.fastperiod = fastperiod
+        self.midperiod = midperiod
+        self.slowperiod = slowperiod
+        self.arr1 = []
+        self.arr2 = []
+        self.arr3 = []
+        self.pre_bias = BIAS_Item(0, 0, 0)
+
+    def add(self, value) -> BIAS_Item:
+        self.arr1.append(value)
+        self.arr2.append(value)
+        self.arr3.append(value)
+        if len(self.arr1) > self.fastperiod:
+            self.arr1 = self.arr1[-self.fastperiod:]
+        if len(self.arr2) > self.midperiod:
+            self.arr2 = self.arr2[-self.midperiod:]
+        if len(self.arr3) > self.slowperiod:
+            self.arr3 = self.arr3[-self.slowperiod:]
+        ma1 = sum(self.arr1) / self.fastperiod
+        ma2 = sum(self.arr2) / self.midperiod
+        ma3 = sum(self.arr3) / self.slowperiod
+        bias1 = (value - ma1) / ma1*100
+        bias2 = (value - ma2) / ma2*100
+        bias3 = (value - ma3) / ma3*100
+        cur_bias = BIAS_Item(bias1, bias2, bias3)
+        self.pre_bias = cur_bias
+        return cur_bias