diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index fe0a3548..fac31a2d 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -7,7 +7,7 @@
 # This file is subject to the terms and conditions defined in
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
-__version__ = '1.1.6.5'
+__version__ = '1.1.6.6'
 from . import lock
 with lock.lock_scope():
     from . import compiler
@@ -196,6 +196,7 @@ def clean():
     gc.collect()
 
 cast = unary
+Var.cast = Var.cast
 
 def array(data, dtype=None):
     if isinstance(data, core.Var):
@@ -250,7 +251,7 @@ Var.norm = norm
 
 origin_reshape = reshape
 def reshape(x, *shape):
-    if len(shape) == 1 and isinstance(shape[0], Sequence):
+    if len(shape) == 1 and isinstance(shape[0], (Sequence, NanoVector)):
         shape = shape[0]
     return origin_reshape(x, shape)
 reshape.__doc__ = origin_reshape.__doc__
@@ -258,7 +259,7 @@ Var.view = Var.reshape = view = reshape
 
 origin_transpose = transpose
 def transpose(x, *dim):
-    if len(dim) == 1 and isinstance(dim[0], Sequence):
+    if len(dim) == 1 and isinstance(dim[0], (Sequence, NanoVector)):
         dim = dim[0]
     return origin_transpose(x, dim)
 transpose.__doc__ = origin_transpose.__doc__
diff --git a/python/jittor/contrib.py b/python/jittor/contrib.py
index bb0c05bd..b759bf70 100644
--- a/python/jittor/contrib.py
+++ b/python/jittor/contrib.py
@@ -147,6 +147,7 @@ def setitem(x, slices, value):
     reindex_reduce_args = (x.shape, reindex_args[1]) + reindex_args[3:]
     xslice = x.stop_fuse().reindex(*reindex_args).stop_fuse()
     value = jt.broadcast(value, xslice)
+    value = value.cast(x.dtype)
     one = jt.broadcast(1, xslice)
     if not isinstance(reindex_args[0][0], jt.Var):
         reindex_args = (x.shape,) + reindex_args[1:]
diff --git a/python/jittor/test/test_binary_op.py b/python/jittor/test/test_binary_op.py
index 1a261a8b..f5d97990 100644
--- a/python/jittor/test/test_binary_op.py
+++ b/python/jittor/test/test_binary_op.py
@@ -33,8 +33,8 @@ class TestBinaryOp(unittest.TestCase):
         assert (x == 8).all()
         x = (jt.array(2) ** jt.array(3)).data
         assert (x == 8).all()
-        a = [1,2,3]
-        b = [7,10,13]
+        a = np.array([1,2,3])
+        b = np.array([7,10,13])
         check("logical_and", a, b)
         check("logical_or", a, b)
         check("logical_xor", a, b)
@@ -79,6 +79,8 @@ class TestBinaryOp(unittest.TestCase):
         
     def test_r(self):
         def check(op, a, b):
+            a = np.array(a)
+            b = np.array(b)
             if jt.flags.use_cuda and op == "@":
                 return
             jb = jt.array(b)
diff --git a/python/jittor/test/test_concat_op.py b/python/jittor/test/test_concat_op.py
index 61ed3074..04b413e4 100644
--- a/python/jittor/test/test_concat_op.py
+++ b/python/jittor/test/test_concat_op.py
@@ -15,9 +15,9 @@ class TestConcatOp(unittest.TestCase):
             res2 = jt.contrib.concat(tmp, dim=dim)
             assert (res1!=res2).data.sum()==0, "concat fail..."
         check([jt.array([[1],[2]]), jt.array([[2],[2]])])
-        check([jt.array(range(24)).reshape((1,2,3,4)), jt.array(range(24)).reshape((1,2,3,4))])
-        check([jt.array(range(120)).reshape((5,2,3,4)), jt.array(range(24)).reshape((1,2,3,4))])
-        check([jt.array(range(5)).reshape((5,1)), jt.array(range(1)).reshape((1,1))])
+        check([jt.array(np.array(range(24))).reshape((1,2,3,4)), jt.array(np.array(range(24))).reshape((1,2,3,4))])
+        check([jt.array(np.array(range(120))).reshape((5,2,3,4)), jt.array(np.array(range(24))).reshape((1,2,3,4))])
+        check([jt.array(np.array(range(5))).reshape((5,1)), jt.array(np.array(range(1))).reshape((1,1))])
         print('concat success...')  
 
 if __name__ == "__main__":
diff --git a/python/jittor/test/test_nano_string.py b/python/jittor/test/test_nano_string.py
index 1f26e0a1..5587d7a4 100644
--- a/python/jittor/test/test_nano_string.py
+++ b/python/jittor/test/test_nano_string.py
@@ -50,7 +50,7 @@ class TestNanoString(unittest.TestCase):
         assert str(jt.NanoString(jt.float32)) == "float32"
         assert str(jt.NanoString(jt.float64)) == "float64"
         assert str(jt.NanoString(jt.int8)) == "int8"
-        assert str(jt.NanoString(jt.array([1,2,3]).dtype)) == "int64"
+        assert str(jt.NanoString(jt.array([1,2,3]).dtype)) == "int32"
         assert str(jt.NanoString(jt.sum)) == "add"
 
         def get_error_str(call):
diff --git a/python/jittor/test/test_node.py b/python/jittor/test/test_node.py
index b84afc52..7ca104d4 100644
--- a/python/jittor/test/test_node.py
+++ b/python/jittor/test/test_node.py
@@ -53,9 +53,9 @@ class TestNode(unittest.TestCase):
         da, db = jt.grad(c, [a, b])
         da.name('da')
         db.name('db')
-        check(5,7,5) # dc, 3, da, 1, db, 1
+        check(5,6,4) # dc, 3, da, 1, db, 1
         del a, b, c
-        check(2,6,4)
+        check(2,5,3)
         da.sync(), db.sync()
         check(2,2,0)
         del da, db
diff --git a/python/jittor/test/test_reshape.py b/python/jittor/test/test_reshape.py
index 10e23447..d2880d3e 100644
--- a/python/jittor/test/test_reshape.py
+++ b/python/jittor/test/test_reshape.py
@@ -70,6 +70,10 @@ class TestReshapeOp(unittest.TestCase):
         assert a.flatten(1).shape == [2,12]
         assert a.flatten(0,-2).shape == [6,4]
 
+    def test_reshape_var(self):
+        a = jt.zeros(10)
+        b = a.reshape(a.shape)
+
 
 if __name__ == "__main__":
     unittest.main()
\ No newline at end of file
diff --git a/python/jittor/test/test_slice.py b/python/jittor/test/test_slice.py
new file mode 100644
index 00000000..a4402475
--- /dev/null
+++ b/python/jittor/test/test_slice.py
@@ -0,0 +1,24 @@
+# ***************************************************************
+# Copyright (c) 2020 Jittor.
+# Authors:
+#     Dun Liang <randonlang@gmail.com>.
+# All Rights Reserved.
+# This file is subject to the terms and conditions defined in
+# file 'LICENSE.txt', which is part of this source code package.
+# ***************************************************************
+import unittest
+import jittor as jt
+import numpy as np
+
+
+class TestSlice(unittest.TestCase):
+    def test_slice_bool(self):
+        a = jt.zeros(10, "bool")
+        a[1] = True
+        a[2] = 1
+        assert a.dtype == "bool"
+        print(a)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/python/jittor/test/test_unary_op.py b/python/jittor/test/test_unary_op.py
index c573b909..c25986e2 100644
--- a/python/jittor/test/test_unary_op.py
+++ b/python/jittor/test/test_unary_op.py
@@ -25,12 +25,12 @@ class TestUnaryOp(unittest.TestCase):
         assert jt.float64(1).data.dtype == "float64"
         assert (jt.abs(-1) == 1).data.all()
         assert (abs(-jt.float64(1)) == 1).data.all()
-        a = [-1,2,3,0]
+        a = np.array([-1,2,3,0])
         check("abs", a)
         check("negative", a)
         check("logical_not", a)
         check("bitwise_not", a)
-        b = [1.1, 2.2, 3.3, 4.4, -1, 0]
+        b = np.array([1.1, 2.2, 3.3, 4.4, -1, 0])
         check("log", a)
         check("exp", a)
         check("sqrt", a)
@@ -42,7 +42,7 @@ class TestUnaryOp(unittest.TestCase):
             "cos", "arccos", "cosh", "arccosh", 
             "sigmoid", 
         ]
-        a = [1.1, 2.2, 3.3, 4.4]
+        a = np.array([1.1, 2.2, 3.3, 4.4])
         for op in ops:
             if op == "abs":
                 b = np.array(a+[-1,])
diff --git a/src/misc/nano_string.h b/src/misc/nano_string.h
index 313f69f4..7fa71737 100644
--- a/src/misc/nano_string.h
+++ b/src/misc/nano_string.h
@@ -156,7 +156,7 @@ NanoString dtype_infer(NanoString v1, NanoString v2, int force_type=0) {
         if (dsize==8) return ns_int64;
         if (dsize==4) return ns_int32;
         if (dsize==2) return ns_int16;
-        return ns_int8;
+        return v1;
     }
 }
 
diff --git a/src/ops/unary_op.cc b/src/ops/unary_op.cc
index 9a652cee..ac6432f2 100644
--- a/src/ops/unary_op.cc
+++ b/src/ops/unary_op.cc
@@ -75,6 +75,10 @@ UnaryOp::UnaryOp(Var* x, NanoString op) : x(x) {
     ASSERT(ns.is_unary() | ns.is_dtype());
     NanoString dtype;
     if (ns.is_dtype()) {
+        if (ns == x->dtype()) {
+            forward(x);
+            return;
+        }
         dtype = ns;
         ns = ns_cast;
     } else if (ns.is_bool())
diff --git a/src/pyjt/numpy.h b/src/pyjt/numpy.h
index 73d1c14d..a2853471 100644
--- a/src/pyjt/numpy.h
+++ b/src/pyjt/numpy.h
@@ -128,6 +128,7 @@ inline int64 PyArray_Size(PyArray_Proxy* arr) {
 union tmp_data_t {
     int32 i32;
     float32 f32;
+    int8 i8;
 };
 
 extern tmp_data_t tmp_data;
diff --git a/src/pyjt/py_converter.h b/src/pyjt/py_converter.h
index cf544362..626dace1 100644
--- a/src/pyjt/py_converter.h
+++ b/src/pyjt/py_converter.h
@@ -261,6 +261,7 @@ DEF_IS(ArrayArgs, bool) is_type(PyObject* obj) {
     return Py_TYPE(obj) == PyArray_Type || 
         PyFloat_CheckExact(obj) ||
         PyLong_CheckExact(obj) ||
+        PyBool_Check(obj) ||
         PyList_CheckExact(obj) ||
         Py_TYPE(obj) == &PyjtVarHolder.ht_type;
 }
@@ -289,6 +290,10 @@ DEF_IS(ArrayArgs, T) from_py_object(PyObject* obj) {
         tmp_data.i32 = PyLong_AsLong(obj);
         return {&tmp_data, 1, ns_int32};
     }
+    if (PyBool_Check(obj)) {
+        tmp_data.i8 = obj == Py_True;
+        return {&tmp_data, 1, ns_bool};
+    }
     if (Py_TYPE(obj) == &PyjtVarHolder.ht_type) {
         auto ptr = GET_RAW_PTR(VarHolder, obj);
         return move(fetch_sync({ptr}).at(0));