Mr.Mustafa, do you have the invitation letter from the organizor of University Model United Nations and an original visa notification from relevant authorities in China, if not, you can only apply for tourist visa, however, I hear that For tourism, Pakistani citizens should first contact a qualified travel agency of China and settled down all the details of the tour. And then the tourist agency may arrange a visa notice form for a travel group (more than 5 people) and a group-visa for you. At present, individual tourists are not accepted.