How can i apply for a X STUDENT visa to study for more than six month in china.

You should find a Chinese university that is qualified to enroll foreign students. Then you should acquire the admission letter from the university. Finally, you should submit your passport, filled application form, a recent passport photo, admission letter (both original and copy versions) and JW201 or JW202 form to Chinese embassy in your country. Please specify that you apply for X1 type in the application form.