diff --git a/xCAT-server/lib/xcat/plugins/anaconda.pm b/xCAT-server/lib/xcat/plugins/anaconda.pm
index 81be4ac41..db8c64bd2 100644
--- a/xCAT-server/lib/xcat/plugins/anaconda.pm
+++ b/xCAT-server/lib/xcat/plugins/anaconda.pm
@@ -12,7 +12,6 @@ use POSIX qw(WNOHANG nice);
 use xCAT::Table;
 use xCAT::Utils;
 use xCAT::MsgUtils;
-use xCAT::Yum;
 use xCAT::Template;
 #use xCAT::Postage;
 use Data::Dumper;
@@ -823,6 +822,7 @@ sub copycd
     #my $rc = system("cd $path; find . | nice -n 20 cpio -dump $installroot/$distname/$arch");
     #my $rc = system("cd $path;rsync -a . $installroot/$distname/$arch/");
     chmod 0755, "$installroot/$distname/$arch";
+    require xCAT::Yum;
     xCAT::Yum->localize_yumrepo($installroot, $distname, $arch);
     if ($rc != 0)
     {
diff --git a/xCAT-server/lib/xcat/plugins/blade.pm b/xCAT-server/lib/xcat/plugins/blade.pm
index 9c40894bd..8ef8de321 100644
--- a/xCAT-server/lib/xcat/plugins/blade.pm
+++ b/xCAT-server/lib/xcat/plugins/blade.pm
@@ -32,7 +32,6 @@ use Storable qw(freeze thaw);
 use IO::Select;
 use IO::Handle;
 use Time::HiRes qw(gettimeofday sleep);
-use Net::Telnet;
 use xCAT::DBobjUtils;
 use Getopt::Long;
 
@@ -2249,6 +2248,7 @@ sub telnetcmds {
   unless (%handled) {
     return([0,\@unhandled]);
   }
+  require Net::Telnet;
   my $t = new Net::Telnet(
                 Timeout=>15, 
                 Errmode=>'return',
diff --git a/xCAT-server/lib/xcat/plugins/boottarget.pm b/xCAT-server/lib/xcat/plugins/boottarget.pm
index 6552a05b8..338b466ce 100644
--- a/xCAT-server/lib/xcat/plugins/boottarget.pm
+++ b/xCAT-server/lib/xcat/plugins/boottarget.pm
@@ -12,7 +12,6 @@ use POSIX qw(WNOHANG nice);
 use xCAT::Table;
 use xCAT::Utils;
 use xCAT::MsgUtils;
-use xCAT::Yum;
 use xCAT::Template;
 #use xCAT::Postage;
 use Data::Dumper;