Abstract: To optimizing the environmental policy making and implementing.Logical analysis frame including evaluated multiple dimensions environmental performance,analyzed multiple scenario and multi-agent implement were designed.Taking Nanjing as example,multiple dimensions environmental performance of Nanjing from 2003 to 2018 was evaluated,three different development scenarios were designed, and the policy demand and paths of high quality of ecological environment were analyzed, and based on the stakeholders theory multi-agent implement was structured.The results show that, the quality of atmospheric environment was better than the city of Beijing-Tianjin-Hebei region,and was worse than the city of Pearl River Delta.There is a growing tendency in environment quality of PM2.5 and PM10 ,but they were not up to the second of atmospheric environment standard（GB3095-2012）,and O3 become more and more polluted, There is a growing tendency in environment quality of water environment,and no worse section than V quality.The decoupling condition between industrial economic and waste water and solid waste emission were in the condition of decoupling in general from 2003 to 2018,but exhaust was in the condition of coupling.The environmental performance of power plant is good,and chemical industry and ironworks is worse.Based on the high target of Yangtze Economic Belt with ecological environment high quality in 2025, coordinated development should be accepted,multiple pollutants should be in synergetic treatment,and multi-agent involving government,company and public should be in cooperative governance.