The construction cost refers to the total cost of the construction of an engineering project. The project construction period is long, the investment is large, the cooperation department is many, in the aspect of valuation, has the single element, the multiple nature, the method diversity and the basis complexity and so on. In order to better carry on the project construction, make the technology and the economy better organic union, improve the construction unit investment benefit and the operation result, must use the scientific management method and the advanced management means to carry on the management to the project cost, the key point is the reasonable determination cost and the effective management cost.