On the first place, one has to apply for the Residence Permit which acts as visa with multiple entries. The permit will be glued in your passport and is valid for one year. The permit is issued by the Division of Aliens and Exit-Entry Administration of the local bureau for Public Safety. When applying for this document, it has to be communicated that the reason of the entry to China is for work purposes. It is no longer possible to change from a tourist visa into a working visa. Other documents that are needed are a certified leasing contract, a certificate of health issued by Entry-Exit Inspection and Quarantine Bureau appointed by the Chinese government or issued by foreign medical agencies accredited by Chinese embassies or consulate offices and a working contract in Chinese with the official company stamp on it. Once the Residence Permit has been granted, the person will have to register at the relevant office of a Police Station again.