Overall control includes whole process control and whole process control: overall control of project cost. Comprehensive cost control is a comprehensive index to evaluate the economic benefits of engineering projects. It involves the relationship between the formation of engineering projects and various departments, units and teams, as well as the self-interest of each employee. Therefore, the cost control of the project needs common concern and assistance. At the same time, the relevant departments, units and individuals should bear the cost responsibility, and hand over the cost target to each department or individual, so as to truly establish the concept of comprehensive control.