diff --git a/app/controllers/trainings_controller.rb b/app/controllers/trainings_controller.rb
index 2f88d634..7b9164b5 100644
--- a/app/controllers/trainings_controller.rb
+++ b/app/controllers/trainings_controller.rb
@@ -108,7 +108,7 @@ class TrainingsController < ApplicationController
     @training = current_training || Training.new(params)
     @training.training_type = @training_type
     if @training_type == 3
-      @training.research_field = params[:research_field].reject(&:blank?).uniq.join(",")
+      @training.research_field = params[:research_field].select(&:present?).uniq.join(",")
       @training.training_category = params[:training_category]
     end
     @training.openid = session[:wechat_open_id]
@@ -126,7 +126,12 @@ class TrainingsController < ApplicationController
       return
     end
 
-    @training.update_attributes(params)
+    @training.assign_attributes(params)
+    if @training.training_type == 3
+      @training.research_field = params[:research_field].select(&:present?).uniq.join(",")
+      @training.training_category = params[:training_category]
+    end
+    @training.save!
     redirect_to pay_training_path(id: @tag_id)
   end
 
diff --git a/app/views/trainings/enroll.html.erb b/app/views/trainings/enroll.html.erb
index 3acb9c3f..4def0abe 100644
--- a/app/views/trainings/enroll.html.erb
+++ b/app/views/trainings/enroll.html.erb
@@ -126,6 +126,8 @@
 <div>
   <p class="collegeInfo"><%= @training_title %></p>
   <%= form_for @training do |f| %>
+    <%= hidden_field_tag(:id, @tag_id) %>
+
     <p class="subtitle">基本信息</p>
     <li class="clearfix infoBar">
       <span class="left_tag fl">姓名</span>
@@ -160,29 +162,29 @@
              name="technical_title"
              value="<%#= @training.technical_title %>"/>-->
     </li>
-    <p class="subtitle">培训类型</p>
+    <% if @training_type == 3 %>
+      <p class="subtitle">培训类型</p>
       <li class="clearfix infoBar">
         <span class="left_tag fl">大数据方向</span>
         <span class="fr">
-          <input type="radio" name="training_category" value="large_data" id="type_1" class="magic-radio">
+          <%= radio_button_tag(:training_category, 'large_data', @training.training_category == 'large_data', id: 'type_1', class: 'magic-radio') %>
           <label for="type_1" style="top:8px">&nbsp;</label>
         </span>
       </li>
       <li class="clearfix infoBar">
         <span class="left_tag fl">人工智能方向</span>
         <span class="fr">
-          <input type="radio" name="training_category" value="ai" id="type_2" class="magic-radio">
+          <%= radio_button_tag(:training_category, 'ai', @training.training_category == 'ai', id: 'type_2', class: 'magic-radio') %>
           <label for="type_2" style="top:8px">&nbsp;</label>
         </span>
       </li>
       <li class="clearfix infoBar">
         <span class="left_tag fl">大数据+人工智能方向</span>
         <span class="fr">
-          <input type="radio" name="training_category" value="large_data_and_ai" id="type_3" class="magic-radio">
+          <%= radio_button_tag(:training_category, 'large_data_and_ai', @training.training_category == 'large_data_and_ai', id: 'type_3', class: 'magic-radio') %>
           <label for="type_3" style="top:8px">&nbsp;</label>
         </span>
       </li>
-    <% if @training_type == 3 %>
       <p class="subtitle">您的授课/研究领域（最少选1项）</p>
       <li class="clearfix infoBar">
         <span class="left_tag fl">机器学习/深度学习</span>