The cost of the project is forecasted and analyzed, and the whole process cost control management method of the project is summarized and discussed in detail, the technical core and management method of cost control in construction project from decision-making, design, bidding, construction to completion are discussed in detail. To develop a series of targeted and Operability cost control measures to meet the requirements of the owners, to build projects of reliable quality and excellent products, and to provide quality services, also in line with the expected benefits of construction enterprises, cost reduction and efficiency, in line with the concept of sustainable development.