Abstract: According to the evolution of natural environment in the Cenozoic, the Formation and development of the Chinese monsoon climate can be divided into three stages： 1. nomonsoon stage during the Eogene；2. palcomonsoon stage during the Neogene； 3. modern monsoon stage. The circulation pattern of modern monsoon was forming when Qinzang Plateau reached about 3000 m in the middle Quaternary.