diff --git a/paddle_quantum/utils.py b/paddle_quantum/utils.py
index 593ec71a84bb97892e0d97822847e5dd507143e4..f8ebb7c5e8d9671be1cf743c2c76dc6426684372 100644
--- a/paddle_quantum/utils.py
+++ b/paddle_quantum/utils.py
@@ -1285,6 +1285,7 @@ def __plot_bloch_sphere(
 def plot_n_qubit_state_in_bloch_sphere(
         state,
         which_qubits=None,
+        show_arrow=False,
         save_gif=False,
         filename=None,
         view_angle=None,
@@ -1313,10 +1314,10 @@ def plot_n_qubit_state_in_bloch_sphere(
     assert type(set_color) == str, \
             'the type of "set_color" should be "str".'
     
-    n_qubits = np.log2(state.shape[0])
+    n_qubits = int(np.log2(state.shape[0]))
 
     if which_qubits is None:
-        which_qubits = list(range(int(n_qubits)))
+        which_qubits = list(range(n_qubits))
     else:
         assert type(show_qubits)==list,'the type of which_qubits should be None or list'
         assert len(show_qubits)==state_len,'展示的量子数量需要小于n_qubits'
@@ -1380,8 +1381,8 @@ def plot_n_qubit_state_in_bloch_sphere(
     # Helper function to plot vectors on a sphere.
     fig = plt.figure(figsize=(8, 8), dpi=100)
     fig.subplots_adjust(left=0, right=1, bottom=0, top=1)
-    dim = np.ceil(sqrt(n_qubit))
-    for i in range(1,n_qubit+1):
+    dim = np.ceil(sqrt(n_qubits))
+    for i in range(1,n_qubits+1):
         ax = fig.add_subplot(dim,dim,i,projection='3d')
         bloch_vector=np.array([bloch_vectors[i-1]])
         __plot_bloch_sphere(