diff --git a/zoomeye/__init__.py b/zoomeye/__init__.py
index 1a8c58c..9689819 100644
--- a/zoomeye/__init__.py
+++ b/zoomeye/__init__.py
@@ -11,5 +11,5 @@
 
 __name__ = 'zoomeye'
 __package__ = 'zoomeye'
-__version__ = ' 2.0.4.3'
+__version__ = ' 2.0.4.4'
 __site__ = "https://www.zoomeye.org/doc"
diff --git a/zoomeye/show.py b/zoomeye/show.py
index ddb155e..fb60960 100644
--- a/zoomeye/show.py
+++ b/zoomeye/show.py
@@ -34,15 +34,15 @@ def convert_str(s):
     d = {
         '\n': '\\n',
         '\r': '\\r',
-        '\t': '\\t'
+        '\t': '\\t',
+        '\b': '\\b',
+        '\a': '\\a',
     }
     for c in s:
-        if ord(c) in range(32, 127):
-            res.append(c)
-        elif c in d.keys():
+        if c in d.keys():
             res.append(d[c])
         else:
-            res.append('\\x%.2x' % ord(c))
+            res.append(c)
     return ''.join(res)
 
 
@@ -320,9 +320,9 @@ def print_filter_history(fileds, hist_data, condition=None):
                 for condition_item in condition:
                     k, v = condition_item.split('=')
                     re_result = re.search(str(v), str(item_item), re.I | re.M)
-                    content = "\033[31m{}\033[0m".format(re_result.group())
                     # replace to highlight
                     if re_result:
-                        item_item = item_item.replace(re_result.group(), content)
+                        content_item = "\033[31m{}\033[0m".format(re_result.group())
+                        item_item = str(item_item).replace(re_result.group(), content_item)
             content += "{:<27}".format(item_item)
         printf(content)