diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7192d736..345dfadc 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -2990,6 +2990,12 @@ module ApplicationHelper
         title << "项目"
       elsif @welcome
         title << "创新源于实践"
+      elsif params[:controller] == "libraries"
+        if @library
+          title << "#{@library.title}"
+        else
+          title << "教学案例"
+        end
       elsif @course
         title << (@course.name.nil? ? "课堂" : @course.name)
       elsif params[:controller] == "homework_bank" || params[:controller] == "question_banks" || params[:controller] == "exercise_bank"