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With the development of social economy, face keen competition more and more between enterprises. And economic globalization as China joins WTO. Cost position and function in market economy, limitation that the traditional method lowers costs, factors such as the development of the business administration thought and setting-up of modern enterprise system,etc. all call the enterprise in charge of construction and set up complete project under construction cost management system. ,The construction of our country faces the severe test, only face one's own question and deficiency, change the project management idea, reform the mechanism of management of the project, improve the office procedure of the project, carry on the management innovation of project constantly, could realize sustainable development. The enterprise in charge of construction sets up complete project under construction cost management system, more scientific management thought instructs the cost of project under