diff --git a/.gitignore b/.gitignore
index 8acc9d4f..1f3be57b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,7 @@ venv/
 !*.src.md
 !README.md
 !README.cn.md
+!CHANGELOG.md
 python/jittor.egg-info
 dist/
 !doc/source/*
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..71bdeed7
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,75 @@
+# CHANGELOG
+
+### 计图 1.1.5.5
+
+* 新增numpy code算子，现在可以直接使用numpy来自定义算子了，使用用例：
+
+```python
+import jittor as jt
+
+def forward_code(np, data):
+    a = data["inputs"][0]
+    b = data["outputs"][0]
+    np.add(a,a,out=b)
+
+def backward_code(np, data):
+    dout = data["dout"]
+    out = data["outputs"][0]
+    np.copyto(out, dout*2.0)
+
+a = jt.random((5,1))
+b = jt.numpy_code(
+    a.shape,
+    a.dtype,
+    [a],
+    forward_code,
+    [backward_code],
+)
+```
+
+* 新增 Function 模块，用户可以自定义反向传播了，使用用例：
+
+```python
+import jittor as jt
+from jittor import Function
+
+class MyFunc(Function):
+    def execute(self, x, y):
+        self.x = x
+        self.y = y
+        return x*y, x/y
+
+    def grad(self, grad0, grad1):
+        return grad0 * self.y, grad1 * self.x
+a = jt.array(3.0)
+b = jt.array(4.0)
+func = MyFunc()
+c,d = func(a, b)
+da, db = jt.grad(c+d*3, [a, b])
+assert da.data == 4
+assert db.data == 9
+```
+
+* 新增 no_grad scope, 在这个scope中创建的所有变量都会停止梯度：
+
+```python
+import jittor as jt
+
+with jt.no_grad():
+    ...
+```
+
+* 新增 bmm（batch matrix multiply） 支持:
+
+```
+import jittor as jt
+from jittor import nn
+
+batch, n, m, k = 100, 5, 6, 7
+
+a = jt.random((batch, n, m))
+b = jt.random((batch, m, k))
+c = nn.bmm(a, b)
+```
+
+* 修复 unsqueeze
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