I have the persmission to study from March 2017 to August 2017 in China.

Hello,
Is it possible, to extend the Visa in China for a second semester?

More facts to explain it better.
My home university in Germany nominated me for 1 semester. With that i can study 1 semester in China and i received X type for 1 semester. On the addmission letter is also only written, that the study period is for 1 semester. Is it possble, when i want to study an additional semester in China. That i extend this X type in China? And if yes, how much would it cost?