Getting Chinese visa in Bishkek on personnel invitation letter for pakistani nationals?

I was a student in china for 4 years now currently I am on a student visa in Bishkek Kyrgyzstan. My summer holidays are coming in June. I want to visit my GF in china. I need to get 3 months Chinese visa.
I have a personal invitation letter from my Chinese GF.
I need to know is it possible for Pakistani nationals to get Chinese visa at personnel invitation letter from a Chinese citizen?
And what other documentation do I need to apply for the visa? Or any other safe way to get the visa if cannot get through personnel invitation?
As I have previous Chinese visas on my passport (X-type, M-type and a transit G type)