Abstract: In this paper, on the basis of decision support system theory, by comprehensively using the theory of system engineering, decision theory, artificial intelligence, fuzzy mathematics, and neural networks, comprehensive assessment problem of ecocity is studied, and basic construction mode of ecocity intelligent comprehensive assessment decision support system( EICADSS) is proposed, and the functions of each part of EICADSS is introduced. Operating principle of importance part is discussed, and the theoretical guidance supplied for ecocity decision is provided.