China visa requirments for Filipinos with US Permanant Resident card

Franklying speaking, it is not a good idea for your Filipino wife to apply a China tourist visa in the Philippines. The visa rule for Filipinos in the Philippines is strict, your wife has to prepare many documents if she is the first time applicant, such as Original NBI clearance, bank certificate. If she is not the first time applicant, she doesn't need to provide the NBI clearance, bank certificate.

You and your wife had better apply for a China tourist visa in USA, a single entry China visa is valid for 3 months, Please apply for a visa about one or two months in advance of your departure to China, and do not apply three months earlier, otherwise, your already-issued visa becoming expired before your departure. I mean that it is ok for you to get a China visa in USA if you won't stay in Philippines for 2.5 or 3 months. For example, you get a single-entry visa in US on March 1, 2012, it is valid for 3 months, you have to use the visa to enter China before June 1, 2012. If you will stay in Philippines for 2.5 or 3 months, your China visa obtained in US will expire before you go to China.