diff --git a/crawler.py b/crawler.py
index 1d814e8f..ec1e6d35 100644
--- a/crawler.py
+++ b/crawler.py
@@ -29,7 +29,7 @@
 
 
 def google_gen_query_url(keywords, face_only=False, safe_mode=False):
-    base_url = "https://www.google.com/search?tbm=isch"
+    base_url = "https://www.google.com/search?tbm=isch&hl=en"
     keywords_str = "&q=" + quote(keywords)
     query_url = base_url + keywords_str
     if face_only is True:
@@ -42,7 +42,7 @@ def google_gen_query_url(keywords, face_only=False, safe_mode=False):
 
 
 def google_image_url_from_webpage(driver):
-    time.sleep(10)
+    # time.sleep(10)
     image_elements = driver.find_elements_by_class_name("rg_l")
     image_urls = list()
     url_pattern = "imgurl=\S*&imgrefurl"
diff --git a/downloader.py b/downloader.py
index 9c2a72ab..9286bc73 100644
--- a/downloader.py
+++ b/downloader.py
@@ -12,8 +12,12 @@
 
 
 headers = {
-    'Connection': 'close',
-    'User-Agent': 'Chrome/54.0.2840.100'
+    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
+    "Proxy-Connection": "keep-alive",
+    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+                  "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
+    "Accept-Encoding": "gzip, deflate, sdch",
+    # 'Connection': 'close',
 }
 
 
@@ -59,6 +63,7 @@ def download_images(image_urls, dst_dir, file_prefix="img", concurrency=50, time
     :param concurrency: number of requests process simultaneously
     :return: none
     """
+
     with concurrent.futures.ThreadPoolExecutor(max_workers=concurrency) as executor:
         futures = list()
         count = 0
diff --git a/mainwindow.ui b/mainwindow.ui
index e5a133e6..db0f39d8 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -737,6 +737,9 @@ per keywords</string>
                <property name="text">
                 <string>HTTP</string>
                </property>
+               <property name="checked">
+                <bool>true</bool>
+               </property>
                <attribute name="buttonGroup">
                 <string notr="true">buttonGroup_2</string>
                </attribute>
@@ -762,7 +765,7 @@ per keywords</string>
                 <string>Socks5</string>
                </property>
                <property name="checked">
-                <bool>true</bool>
+                <bool>false</bool>
                </property>
                <attribute name="buttonGroup">
                 <string notr="true">buttonGroup_2</string>
@@ -776,6 +779,15 @@ per keywords</string>
                  <pointsize>12</pointsize>
                 </font>
                </property>
+               <property name="toolTip">
+                <string>input ip:port</string>
+               </property>
+               <property name="statusTip">
+                <string>xxx.xxx.xxx.xx:port</string>
+               </property>
+               <property name="placeholderText">
+                <string>xxx.xxx.xxx.xx:port</string>
+               </property>
               </widget>
              </item>
             </layout>
diff --git a/ui_mainwindow.py b/ui_mainwindow.py
index bafc89a2..fecde092 100644
--- a/ui_mainwindow.py
+++ b/ui_mainwindow.py
@@ -416,6 +416,7 @@ def setupUi(self, MainWindow):
         font.setPointSize(12)
         self.radioButton_http.setFont(font)
         self.radioButton_http.setFocusPolicy(QtCore.Qt.TabFocus)
+        self.radioButton_http.setChecked(True)
         self.radioButton_http.setObjectName(_fromUtf8("radioButton_http"))
         self.buttonGroup_2 = QtGui.QButtonGroup(MainWindow)
         self.buttonGroup_2.setObjectName(_fromUtf8("buttonGroup_2"))
@@ -431,7 +432,7 @@ def setupUi(self, MainWindow):
         font.setPointSize(12)
         self.radioButton_socks5.setFont(font)
         self.radioButton_socks5.setFocusPolicy(QtCore.Qt.TabFocus)
-        self.radioButton_socks5.setChecked(True)
+        self.radioButton_socks5.setChecked(False)
         self.radioButton_socks5.setObjectName(_fromUtf8("radioButton_socks5"))
         self.buttonGroup_2.addButton(self.radioButton_socks5)
         self.horizontalLayout_3.addWidget(self.radioButton_socks5)
@@ -557,6 +558,9 @@ def retranslateUi(self, MainWindow):
         self.checkBox_proxy.setText(_translate("MainWindow", "&Proxy:", None))
         self.radioButton_http.setText(_translate("MainWindow", "HTTP", None))
         self.radioButton_socks5.setText(_translate("MainWindow", "Socks5", None))
+        self.lineEdit_proxy.setToolTip(_translate("MainWindow", "input ip:port", None))
+        self.lineEdit_proxy.setStatusTip(_translate("MainWindow", "xxx.xxx.xxx.xx:port", None))
+        self.lineEdit_proxy.setPlaceholderText(_translate("MainWindow", "xxx.xxx.xxx.xx:port", None))
         self.menuAbout.setTitle(_translate("MainWindow", "Help", None))
         self.actionAbout.setText(_translate("MainWindow", "About", None))
 
diff --git a/utils.py b/utils.py
index a4210a30..9cf5c718 100644
--- a/utils.py
+++ b/utils.py
@@ -1,6 +1,12 @@
 # -*- coding: utf-8 -*-
 
 
+def gen_valid_dir_name_for_keywords(keywords):
+    keep = ["-", "_", "."]
+    keywords = keywords.replace(" ", "_").replace(":", "-")
+    return "".join(c for c in keywords if c.isalnum() or c in keep).rstrip()
+
+
 class AppConfig(object):
     def __init__(self):
         self.engine = "Google"
@@ -29,7 +35,7 @@ def to_command_paras(self):
 
         str_paras += ' -j ' + str(self.num_threads)
 
-        str_paras += ' -o "' + self.output_dir + '/' + self.keywords + '"'
+        str_paras += ' -o "' + self.output_dir + '/' + gen_valid_dir_name_for_keywords(self.keywords) + '"'
 
         if self.face_only:
             str_paras += ' -F '