I just changed the max_execution_time 30 to 300.
but another error message comes out
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‘DOMDocument’ not found in …..
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And I founded this article.
http://vanillaforums.org/discussion/22002/solved-fatal-error-class-domdocument-not-found-in-var-www-html-community-answers
and bellow command makes import works.
sudo yum install php-xml
Thanks for your help.