If you are F1, you should file a tax return as non-resident for the first five years using 1040NR or 1040NR-EZ form. For NR, only US income is taxable. You may also claim a tax treaty if you came from China directly as F1.
Search my previous posts or IRS website, there is a very nice and detailed tutorial that covers almost every different conditions for people file their tax return as a non-resident.