diff --git a/txt2mobi/txt2html.py b/txt2mobi/txt2html.py
index d548e0a..196899a 100644
--- a/txt2mobi/txt2html.py
+++ b/txt2mobi/txt2html.py
@@ -151,29 +151,34 @@ def __is_chapter_title(self, line):
                 if re.match(self.title_filter, strip_line):
                     return True
         else:
-            if line.strip().startswith(u'第'):
-                if 3 < len(line.strip()) < 30 and u"第" in line and u"章" in line:
-                    return True
-            if line.strip().startswith(u'第'):
-                if 3 < len(line.strip()) < 30 and u"第" in line and u"张" in line:
-                    return True
-            if line.strip().startswith(u'正文 第'):
-                if 3 < len(line.strip()) < 30 and u"第" in line and u"章" in line:
-                    return True
-            line = line.replace(u"．", u".").replace(u":", u".")
-            if line.split('.')[0].isdigit():
-                if 3 < len(line.strip()) < 20:
-                    return True
-            if len(line) < 20 and (line.strip()[:3].isdigit() or line.strip()[:4].isdigit()):
-                return True
-            if len(line) < 40 and u"第" in line and u"卷" in line:
-                if line[line.index(u"第") + 1: line.index(u"卷")] in [u"一", u"二", u"三", u"四", u"五", u"六", u"七", u"八", u"九", u"十"]:
-                    return True
-            if line.strip().startswith(u'[第'):
-                if 3 < len(line.strip()) < 30 and u"第" in line and u"章" in line:
-                    return True
+            flag = "content"
+            for ch in line:
+                if flag == "content" and ch == u"第":
+                    flag = "starttitle"
+                    continue
+
+                if flag == "starttitle":
+                    if (ch == " " or ch == u" "):
+                        flag = "starttitle"
+                        continue
+                    elif  re.match(u"([0-9一二三四五六七八九十]+)", ch):
+                        flag = "number"
+                        continue
+                    else:
+                        flag = "content"
 
-        return False
+                if flag == "number" :
+                    if re.match(u"([0-9一二三四五六七八九十]+)", ch):
+                        flag = "number"
+                        continue
+                    elif  (ch == " " or ch == u" "):
+                        flag = "number"
+                        continue
+                    if  (ch == u"张" or ch == u"章" or ch == u"卷"):
+                        return True
+                    else:
+                        flag = "content"
+        return  False
 
     def process_lines(self, lines):
         """