How about a Japanese passport? I want to study in Xinjiang …

There are three ways for China citizens to apply for foreign visas:

(1) I apply directly to foreign embassies and consulates in China;

(2) Entrust the visa office of China Travel Agency (generally limited to tourist visas);

(3) Foreign relatives and friends directly apply for a visa to the country's immigration bureau.

So you have to go to the Japanese consulate in Xinjiang. You can ask the local police station about this. They should be able to help you. Good luck.