Iwould like to study Msc.Mathematics in china , which university may I have to apply ?

Many Chinese universities have that kind of majors, but whether you can apply it depends on your scores and your talent on that major. The university choosing also depends on which part do you want to stay in China. If you want to live in northern part of China, I think the Tsinghua University and Peking University are necessary to apply. Otherwise, you can choose the Fudan University and so on.