Project schedule control is one of the important control goals in project management. It is an important measure to ensure that the project is completed safely, reasonable arrangements for the resources supply and saving cost. Any of the projects must be by means of scientific planning and control methods in order to achieve the desired goals. Deviation analysis is an ongoing work in the progress of project, how to determine the deviation of project timely and accurately, the method that used is crucial. This paper chose a highway construction project as research object, using the Inspection Acts include Gantt chart, S-shaped curve and Banana-shaped curve of schedule, and made the comparative analysis for project to identify deviations and take measures to adjust in order to ensure the project is completed on schedule.