I am Cambodian student, studying in ogaki Gifu, I want go holiday 1 week china , how can Get visa?

You should first prepare the relevant materials including your residence permit in Japan, the application form affixed with a recently-taken passport-style photo, your passport and its copy, round trip air tickets and hotel booking record.
Next, submit the application to the CVASC in Nagoya to apply for Chinese tourist L type entry permit.