In order to improve the level of civil engineering construction and reduce the cost of construction expenditures, research on civil engineering management and engineering cost control methods is carried out. Comprehensively consider the risk factors that may increase the additional expenditures of the construction of the construction site, and manage the sub-items of the basic cost of civil engineering in a targeted manner; control the cost of the civil engineering project in each construction stage according to the three steps before, during and after the event expenditure. Choose a real project as the experimental project, and control the project construction expenditure with reference to the designed control method. After practice, it is proved that this method can realize the control of the actual expenditure of the expenditure cost project during the construction process to ensure that the project is in the existing High-quality completion within the scope of funds.