Project cost (PC) refers to the construction cost that constitutes the estimated or actual expenditure of the project during the construction period. The process of forecasting, planning, controlling, accounting, analyzing and evaluating the project cost by comprehensively applying the knowledge and skills of management, economics and engineering technology is called project cost management (PCM). According to the procedures, methods and basis stipulated by laws, regulations and standards, the project cost and its components are predicted or determined, which is called CPE.