Abstract: In order to arrange the progress of engineering constructions rationally and make optimal use of resources, subjects such as operational research, economics, engineering science, decision making management,etc. are used comprehensively on a man-computer interactive system to produce an optimum decision support system for project construction plan (PODSS). The functions, structure and main models of the system are described and elaborated, with the corresponding software developed. The experimental result shows that the system can provide an assist management and decision-making environment for the planners of engineering construction projects and spot managers, and is an effective technological tool for construction firms to make scientific decision.