This paper examines changes of population pressure on the ecological environment and its spatial variation in China． Data are collected from the statistical yearbooks of 31 provincial administrative areas in 1990，1995，2000，2005 and 2010. Using a geographic information system ( GIS) and relevant models，this paper analyzes trends in the population pressure on ecological environment and the change of the gravity center of ecological environment quality in China． Generally，population pressure on the ecological environment in China is becoming higher，population and environment has been in serious imbalance，and the ecological environment is suffering from serious pollution． While population pressure on the ecological environment is becoming lower in some areas，the ecological environment is getting worse． Areas of super high population pressure on the ecological environment include Beijing，Tianjin and Shanghai． There is a far distance between the gravity center of population pressure on the ecological environment and the gravity center of ecological environment quality，but the general trend is that they are moving from West to East China．Finally this paper discusses policy suggestions on improving ecological environment quality．