Hi Franky,
QUOTE:
I tried to export the tables using phpmyadmin and mysqldump, but the exported sql file that generated by both phpmyadmin and mysqldump can not show my utf8 chinese chars correctly.
Do you mean they are garbled?
If so try
BabelPad to view the dump locally, set the font to an Unicode font to see if it renders as it should:
If it looks ok try to import using "phpmyadmin" just copy/paste into the SQL window.
If the tables are already there you will only need to insert the "INSERT" statements from each table this may also help get around any "DEFAULT CHARSET" that has been incorrectly set in the source site.
It may also be a good idea first using "phpmyadmin" to use the empty feature to "TRUNCATE" the tables in question.