how to apply tourist visa? im going to china to get married, how much is the maintaining balance of bank accounts?

There is no detailed requirements on how much money you should put in your account. It just requires you to provide your recent six month's bank statement. However, your money should support your total expense during your stay in China. It's probably 100USD per day.

If you can't provide the bank statement, you may provide BIR-stamped income tax return form, a certificate from your employer which states your income and length of service or your professional ID.