It is ok to contact to schools for follow-ups and confirmation. You can contact the school regular basis, for example, once or twice in a month. Please contact, if possible, the person who has engaged with you in the process of application because she or he know you. Please do not ask others so called 'influential persons' to call the school on behalf of your admission. You do not want to give an impression that you use other person's power to gain admission. In general, the schools absolutely do not like that. Remember they do have tons of Chinese student applications. That type of actions will add to your application another reason not to accept you.。