diff --git a/EduNLP/Formula/Formula.py b/EduNLP/Formula/Formula.py
index 77e5f7d0..6eb80049 100644
--- a/EduNLP/Formula/Formula.py
+++ b/EduNLP/Formula/Formula.py
@@ -17,18 +17,6 @@ class Formula(object):
     """
     The part transform a formula to the parsed abstracted syntax tree.
 
-    Attributes
-    ------------
-    ast
-        show all ast details
-    elements
-        just show elements' id, type, text and role
-    ast_graph
-        draw a ast graph
-    to_str
-    resetable
-        return bool
-
     Parameters
     ----------
     formula: str or List[Dict]
@@ -54,6 +42,17 @@ class Formula(object):
     >>> f.elements
     [{'id': 0, 'type': 'mathord', 'text': 'x', 'role': None, 'var': 0}]
 
+        Attributes
+    ------------
+    ast
+        show all ast details
+    elements
+        just show elements' id, type, text and role
+    ast_graph
+        draw a ast graph
+    to_str
+    resetable
+        return bool
     """
     def __init__(self, formula: (str, List[Dict]), variable_standardization=False, const_mathord=None,
                  init=True, *args, **kwargs):
diff --git a/EduNLP/SIF/segment/segment.py b/EduNLP/SIF/segment/segment.py
index 7e9ed5ed..39e2f869 100644
--- a/EduNLP/SIF/segment/segment.py
+++ b/EduNLP/SIF/segment/segment.py
@@ -82,6 +82,22 @@ class SepSegment(str):
 class SegmentList(object):
     """
 
+    Parameters
+    ----------
+    item
+    figures:dict
+
+    Returns
+    ----------
+    list
+        tokenizated item
+
+    Examples
+    --------
+    >>> test_item = "如图所示，则三角形$ABC$的面积是$\\SIFBlank$。$\\FigureID{1}$"
+    >>> SegmentList(test_item)
+    ['如图所示，则三角形', 'ABC', '的面积是', '\\\\SIFBlank', '。', \\FigureID{1}]
+
     Attributes
     ----------
     segments
@@ -98,22 +114,6 @@ class SegmentList(object):
         show tag segments
     describe
         show number of each elements
-
-    Parameters
-    ----------
-    item
-    figures:dict
-
-    Returns
-    ----------
-    list
-        tokenizated item
-
-    Examples
-    --------
-    >>> test_item = "如图所示，则三角形$ABC$的面积是$\\SIFBlank$。$\\FigureID{1}$"
-    >>> SegmentList(test_item)
-    ['如图所示，则三角形', 'ABC', '的面积是', '\\\\SIFBlank', '。', \\FigureID{1}]
     """
     def __init__(self, item, figures: dict = None):
         self._segments = []