I get that answer.
I go to this file: wp-includes/deprecated.php
and find this line in (deprecated) wp_get_http()
function:
@set_time_limit ( 60 );
just comment out this line and it works fine.
Because wordpress hard coded that 60 seconds limit, this hard coded setting was over-ridding my php.ini
settings. so I comment out that line, my php.ini
settings will start working again.