To the subjects in the project department of economic responsibility for the "joint venture project management", data acquiring becomes the key step for enterprise management in cost management informationization. According practical conditions in Zhejiang enterprises, we present an informationization model for cost management:"separate price from quantity for principle, project progressing for main line, part and time for check node". During building informationization, it also combine with practical conditions of enterprise to create key control system for project, construct enterprise system and find the balance between premium quality series informatization assesssment and self-management requirement of enterprise. While developing cost manage informationization module to make it to be an valid and pragmatic one, it is absolutely necessory to consider the practise operation situation of project department.