Problem about character set

I read data from excel using oracle com automation feature in plsql program and insert them into tables, but all chinese in the excel file was "?",how should I do?
thanks.

american_america.us7ascii You cannot store chinese character in this character set. US7ASCII stores data in 7Bits, which doesn't support non-ascii characters.
You'll have to change the character set of your database to Unicode based character set to store the chinese characters.
HTH
Naveen

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