In the current project construction, there are four basic factors that affect the project cost: first, the construction period, second, the quality, third, the cost itself, and fourth, the personnel. These four factors can influence and transform each other. The change of construction period and quality can affect and transform the change of cost under certain conditions, and the change of cost will also directly affect and transform the change of quality and construction period. The quality of the labor force will also affect the cost. For example, when it is necessary to shorten the construction period, it is necessary to increase the investment of additional resources and generate some expenses such as overtime pay, so that' shortening the construction period' is transformed into' increasing costs'; When it is necessary to improve the quality of the project, it is also necessary to increase the input of resources, so that' quality improvement' can be transformed into' cost increase'; On the contrary, when the cost of a project is cut, its construction period and quality will be directly affected, which may not only reduce the quality, but also delay the construction period. Therefore, for project cost management, it is necessary to start with four factors that affect the cost. According to the mutual influence and interdependence of personnel, construction period, quality and cost, the method of integrated management of all factors is adopted. Overall management of project cost. This paper puts forward a set of integrated management methods of various elements of project cost. This method is different from the traditional cost management method, and it is a technical method to comprehensively manage the project cost by comprehensively considering all factors affecting the project cost.