diff --git a/xCAT-server/lib/xcat/plugins/boottarget.pm b/xCAT-server/lib/xcat/plugins/boottarget.pm
index 74a0dda2f..62def8f64 100644
--- a/xCAT-server/lib/xcat/plugins/boottarget.pm
+++ b/xCAT-server/lib/xcat/plugins/boottarget.pm
@@ -110,23 +110,14 @@ sub mknetboot
     my $req      = shift;
     my $callback = shift;
     my $doreq    = shift;
-    my $tftpdir  = "/tftpboot";
     my $nodes    = @{$request->{node}};
     my @args     = @{$req->{arg}};
     my @nodes    = @{$req->{node}};
     my $ostab    = xCAT::Table->new('nodetype');
-    my $sitetab  = xCAT::Table->new('site');
-    my $installroot;
-    $installroot = "/install";
+ 
+    my $installroot = xCAT::Utils->getInstallDir();
+    my $tftpdir = xCAT::Utils->getTftpDir();
 
-    if ($sitetab)
-    {
-        (my $ref) = $sitetab->getAttribs({key => installdir}, value);
-        if ($ref and $ref->{value})
-        {
-            $installroot = $ref->{value};
-        }
-    }
     my %donetftp=();
     my %oents = %{$ostab->getNodesAttribs(\@nodes,[qw(os arch profile)])};
     my $restab = xCAT::Table->new('noderes');