Initially, construction companies, especially decision-makers, still adhere to the original construction mechanism of subcontracting, the overall concept of the project is not sound, and there is a gap between the construction project and the actual research. The beginning of the design, the current status of the planning and the project appeared. If there are inconsistencies, it is impossible to control the overall process design cost according to the design plan, nor is it possible to create an effective one. Cost control plan for the whole process.