Ecological city is the development direction of future city.Qinhuangdao City is regionalized in order to enforce ecological city construction preferably and achieve the sustainable development of regional economy.By making use of 3S technology and combining ecological function regionalization with the main function regionalization,the city is divided into 3 main function regions,7 ecological subregions,and 29 ecological function regions.The regionalization work is based on the assessment of ecological environment and the integration of the regional resource distribution with social economical development indicators.The main ecological function and development direction are put forward for every function region.At last,the feasible advises are put forth in order to realize ecological function regionalization.