diff --git a/imperative/python/megengine/distributed/helper.py b/imperative/python/megengine/distributed/helper.py
index b70e2da1..78360fac 100644
--- a/imperative/python/megengine/distributed/helper.py
+++ b/imperative/python/megengine/distributed/helper.py
@@ -28,14 +28,14 @@ from .group import WORLD, Group, group_barrier, is_distributed, override_backend
 
 
 def param_pack_split(inp: Tensor, offsets: list, shapes: list):
-    r"""Returns split tensor to tensor list as offsets and shapes described,
+    r"""Returns split tensor to list of tensors as offsets and shapes described,
     only used for ``parampack``.
 
     Args:
         inp: input tensor.
-        offsets: offsets of outputs, length of `2 * n`,
-            while n is tensor nums you want to split,
-            format `[begin0, end0, begin1, end1]`.
+        offsets: offsets of outputs, length of ``2 * n``,
+            where ``n`` is the number of tensor you want to split,
+            format ``[begin0, end0, begin1, end1]``.
         shapes: tensor shapes of outputs.
 
     Returns:
@@ -43,25 +43,14 @@ def param_pack_split(inp: Tensor, offsets: list, shapes: list):
 
     Examples:
 
-        .. testcode::
-
-           import numpy as np
-           from megengine import tensor
-           from megengine.distributed.helper import param_pack_split
-
-           a = tensor(np.ones((10,), np.int32))
-           b, c = param_pack_split(a, [0, 1, 1, 10], [(1,), (3, 3)])
-           print(b.numpy())
-           print(c.numpy())
-
-        Outputs:
-
-        .. testoutput::
-
-           [1]
-           [[1 1 1]
-            [1 1 1]
-            [1 1 1]]
+        >>> a = F.ones(10)
+        >>> b, c = dist.helper.param_pack_split(a, [0, 1, 1, 10], [(1,), (3, 3)])
+        >>> b
+        Tensor([1.], device=xpux:0)
+        >>> c
+        Tensor([[1. 1. 1.]
+         [1. 1. 1.]
+         [1. 1. 1.]], device=xpux:0)
     """
     op = ParamPackSplit()
     op.offsets = offsets
@@ -74,34 +63,22 @@ def param_pack_concat(inps: list, offsets: Tensor, offsets_val: list):
     r"""Returns concated tensor, only used for ``parampack``.
 
     Args:
-         inps: input tensors.
+         inps: list of input tensors.
          offsets: device value of offsets.
-         offsets_val: offsets of inputs, length of `2 * n`,
-            format `[begin0, end0, begin1, end1]`.
+         offsets_val: offsets of inputs, length of ``2 * n``,
+            format ``[begin0, end0, begin1, end1]``.
 
     Returns:
          concated tensor.
 
     Examples:
 
-         .. testcode::
-
-            import numpy as np
-            from megengine import tensor
-            from megengine.distributed.helper import param_pack_concat
-
-            a = tensor(np.ones((1,), np.int32))
-            b = tensor(np.ones((3, 3), np.int32))
-            offsets_val = [0, 1, 1, 10]
-            offsets = tensor(offsets_val, np.int32)
-            c = param_pack_concat([a, b], offsets, offsets_val)
-            print(c.numpy())
-
-         Outputs:
-
-         .. testoutput::
-
-            [1 1 1 1 1 1 1 1 1 1]
+         >>> a = F.ones(1)
+         >>> b = F.ones((3, 3))
+         >>> offsets_val = [0, 1, 1, 10]
+         >>> offsets = Tensor(offsets_val)
+         >>> c = dist.helper.param_pack_concat([a, b], offsets, offsets_val)  # doctest: +SKIP
+         Tensor([1. 1. 1. 1. 1. 1. 1. 1. 1. 1.], device=xpux:0)
     """
     op = ParamPackConcat()
     op.offsets = offsets_val