I deactivated all plugins and then reactivate each one individually but i got the same problem.
I also tried with wordpress default theme.
Today i found this:--
32243 spotthis 0 26.6 3.5 /usr/bin/php /home/spotthis/public_html/wp-admin/post-new.php
32540 spotthis 0 17.0 2.0 /usr/bin/php /home/spotthis/public_html/wp-admin/edit.php
28132 spotthis 0 14.0 1.0 /usr/bin/php /home/spotthis/public_html/index.php
28086 spotthis 0 8.0 2.9 /usr/bin/php /home/spotthis/public_html/index.php
28105 spotthis 0 6.3 2.7 /usr/bin/php /home/spotthis/public_html/index.php
28106 spotthis 0 6.2 2.7 /usr/bin/php /home/spotthis/public_html/index.php
28116 spotthis 0 5.6 2.0 /usr/bin/php /home/spotthis/public_html/index.php
28120 root 0 2.7 2.5 whostmgr2 - top ./top
With this report i think that the most of the CPU use is by wordpress .php files
Please help me