diff --git a/core/__init__.py b/core/__init__.py
index 7f281279d8a0c35355974ca258e4d40e70ce1e3b..19991f0af8933d29935a6a601cc7e1dcedf3153f 100644
--- a/core/__init__.py
+++ b/core/__init__.py
@@ -1,6 +1,7 @@
 import matplotlib.pyplot as plt
-import numpy as np
-import pandas as pd
+import numpy
+import pandas
+import sympy
 
 # 导入基本数学变量和函数
 from math import (
@@ -146,18 +147,24 @@ def version():
     print("1.0.1")
 
 
-def size(x) -> np.array:
+def size(x):
     """
     获取矩阵的行数和列数
 
     参数
     ----------
-    x : np.array
+    x : numpy.ndarray, pandas.DataFrame, sympy.Matrix
+
+    注意
+    ----------
+    （1）返回长度时，仅针对最外层，不做深度统计
     """
-    if type(x) is np.ndarray:
-        return x.shape
-    else:
-        try:
-            return np.array(x).shape
-        except:
-            return "data type is not support"
+    sizeFunc = [
+    	numpy.ndarray, pandas.DataFrame, sympy.Matrix
+    ]
+    try:
+    	res = len(x) if type(x) not in sizeFunc else x.shape
+    	return(res)
+    except:
+    	e = str(type(x)).split("'")[1]
+    	raise TypeError("'{}' object does not support checking size!".format(e)