Finally i solved my problem and would like to share it with you friends as i think it is a best linux forum which i can find.
I did the following as per your advise.
yum clean all
yum make cache
It Doesnt Work for me.
but solved the problem after that i edit /etc/yum.conf
and add the
'packages' means that only RPM package downloads should be cached (but not repository metadata downloads).
yum clean metadate
my yum.conf look like this: