diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index ee2a6d10..99269ce9 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -8,7 +8,7 @@
 # This file is subject to the terms and conditions defined in
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
-__version__ = '1.2.2.29'
+__version__ = '1.2.2.30'
 from . import lock
 with lock.lock_scope():
     ori_int = int
diff --git a/python/jittor/misc.py b/python/jittor/misc.py
index 74ceab64..f88f4d6c 100644
--- a/python/jittor/misc.py
+++ b/python/jittor/misc.py
@@ -483,11 +483,6 @@ def arange(start=0, end=None, step=1,dtype=None):
         x= x.cast(dtype)
     return x
 
-def randperm(n, dtype="int64"):
-    x = np.arange(n)
-    np.random.shuffle(x)
-    return jt.array(x).cast(dtype)
-
 def log2(x):
     return jt.log(x)/math.log(2.0)
 
@@ -1003,10 +998,10 @@ def linspace(start, end, steps):
     res = res*(end-start)/float(steps-1)+start
     return res
 
-def randperm(n):
-    # TODO: use jt.random
-    idx = np.arange(n)
-    return jt.array(np.random.permutation(idx))
+def randperm(n, dtype="int32"):
+    key = jt.random((n,))
+    index, _ = jt.argsort(key)
+    return index.cast(dtype)
 
 def set_global_seed(seed):
     import random