The first meaning is defined in terms of investors. The project cost of a construction project refers to the capital construction cost of the construction project, that is, all the expenses of the estimated or specific new project, including engineering construction engineering, installation engineering, machinery and equipment and related expenses. In this sense, the project cost is the project investment cost and the fixed capital investment of the construction project.This meaning is for investors, community owners and builders. It means that when investors select a new investment project, in order to better obtain the estimated economic benefits, they need to carry out management decisions according to the project evaluation, and then carry out design scheme bidding meeting and engineering supervision bidding meeting until the engineering acceptance. In all processes, Drug payment is related to the cost of project construction, so the project cost is the investment cost. The engineering cost of productive and operational construction projects is the comprehensive of the fixed capital investment and the working capital investment of new projects, and the engineering cost of non productive investment new projects is the total amount of fixed capital investment of new projects;