Hello, I want to change regionHello,i want to change my apple id region,please reset my amount to zero. Thanks

We can't, we are fellow users.

Contact iTunes Support and ask them to do it :  http://www.apple.com/support/itunes/ww  (click on your country's flag, the country where you now live ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)

As posted above, either buy something more expensive and pay the balance with a credit card or contact iTunes Support and ask them to zero balance your account. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  You may need to pick a problem that is slightly different than yours to get a chat option.  

iTunes Support

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Hello, I want to change regionHello,i want to change my apple id region,please reset my amount to zero. Thanks