diff --git a/anolis-courses/anolis_install_DDE/install_dde/step1.md b/anolis-courses/anolis_install_DDE/install_dde/step1.md
index 003f75082c1ffa3bd0d64f186423e7d432b402a1..cd40adcff59ee0c2c72fda6533bd5eb5df3a02d1 100644
--- a/anolis-courses/anolis_install_DDE/install_dde/step1.md
+++ b/anolis-courses/anolis_install_DDE/install_dde/step1.md
@@ -10,11 +10,21 @@
 
 3. 修改系统软件仓库配置中的仓库地址。
 
-[[ sed -i "s/\$releasever/8\.4/g" \`find /etc/yum.repos.d/ -name *.repo ]]
+[[ repos=$(find /etc/yum.repos.d/ -name *.repo);for repo in $repos; do sed -i "s/8/8\.4/g" $repo; done; ]]
 
-4. 修改Anolis-DDE.repo文件内容。
+[[ yum-config-manager --disable epel-modular ]]
 
-[[ 
+[[ yum-config-manager --disable epel ]]
+
+4. 修改测试环境的glibc软件包版本
+
+[[ yum remove glibc-gconv-extra ]]
+
+[[ yum downgrade glibc ]]
+
+5. 修改Anolis-DDE.repo文件内容。
+
+``` 
  [DDE]
  name=AnolisOS-8.4 - DDE
  baseurl=http://mirrors.openanolis.cn/anolis/8.4/DDE/$basearch/os
@@ -27,4 +37,4 @@
  enabled=1
  gpgkey=http://mirrors.aliyun.com/epel/RPM-GPG-KEY-EPEL-8
  gpgcheck=0
- ]]
+```
diff --git a/anolis-courses/anolis_install_DDE/install_dde/step2.md b/anolis-courses/anolis_install_DDE/install_dde/step2.md
index 2a668d0a6dbaaf05879bce6a483aaa3c1cf1939d..a8faa25ab128e2536ab7e4000ddbcd3f4afcc84b 100644
--- a/anolis-courses/anolis_install_DDE/install_dde/step2.md
+++ b/anolis-courses/anolis_install_DDE/install_dde/step2.md
@@ -3,5 +3,6 @@
 [[ sudo yum clean all && yum makecache ]]
 
 2. DDE软件包安装。
+
 [[ sudo yum groupinstall dde ]]