In large-scale traffic construction, due to low investment, high standards, great technical difficulties and tight construction period, ensuring and improving the project quality is naturally mentioned in an important position. A large number of practices at home and abroad have also confirmed that the implementation of supervision engineer system in engineering construction is an effective means to ensure engineering quality. 1 project quality control is the key. 1. 1 The division of labor should be clear, and the responsibility should be implemented to people. Make a clear division of labor according to the project, especially the key parts such as subgrade earthwork, bridge and culvert structure and pavement structural layers. To achieve a clear division of labor, so as to control and manage each process in an all-round and whole process. This will prevent confusion and unclear responsibilities from affecting work efficiency. 1.2 The main basis for quality control is contract terms, technical specifications and design drawings. The design drawings and technical specifications stipulate the quality standards of the project, while the contract terms require the construction unit to carry out the construction according to the material properties, construction technology and allowable deviation indicated in the design drawings and technical specifications. The basic requirement of quality control is to control raw materials and construction process. Therefore, on-site supervision and management should be carried out according to the basis and requirements of quality control. ① Strictly controlling the quality of raw materials entering the site is the basis of engineering quality control. Raw materials are the fundamental reason that affects the quality of highway engineering, so it is necessary to strengthen the inspection and testing of raw materials used, which requires us to carry out sampling tests and testing continuously before and after raw materials enter the site, which is the basis of quality supervision and monitoring. Once unqualified materials are found, they will be refused entry or use, and the hidden dangers affecting quality will be nipped in the bud. ② Whole process supervision is the basic method of engineering quality control. The whole process supervision is to control the project quality before, during and after. Pre-control refers to the control in the project preparation stage, such as the review of measurement results, the examination and approval of test data, and the careful scrutiny of construction technology. Process control refers to the control of engineering construction process, such as the handling of emergencies and the supervision of human factors. Post-event control refers to the quality control after the completion of the project, such as the rework treatment of insufficient concrete strength and the finishing that does not affect the internal quality. ③ Concealed engineering supervision is the key point of engineering quality control. Concealed engineering is the hidden point of quality hidden danger and the most difficult to control. It is difficult to control because of its concealment. As a supervision control, the best way is to carry out process control, carefully check every working procedure in the construction process, stand by in an all-round way, be quick-sighted, quick-spoken and quick-acted, find out the defects in construction in time, and quickly eliminate them to avoid the emergence of engineering hidden dangers. After the completion of an independent highway project or structure, it must be ④ that the engineering test is the basis for evaluating the engineering quality. On the one hand, the purpose of engineering test is to save resources to the maximum extent and improve economic benefits on the premise of ensuring quality; On the other hand, it provides test data for engineering quality evaluation through quality inspection and control in the process of engineering construction and project completion. FIDIC terms are based on data, and the quality cannot be judged by subjective imagination. Therefore, the service function of the experiment should be paid enough attention. 1.3 On-site supervision is an important means of supervision and monitoring. On-site supervision is mainly accomplished through patrol and standby. The supervision engineer should patrol, stand by, sample and inspect every working procedure in the project construction, find problems in time, and remind the contractor to take effective treatment measures to control the quality error within the allowable range. So as to fully guarantee the construction quality of the project. For each patrol inspection, it should be recorded in the supervision log in detail, so as to find relevant engineering data in the future and make a comprehensive evaluation of the whole project quality in time. 2. Effective project progress control 2. 1 Site supervisors are required to decompose the progress of partial projects one by one and control them separately, and make corresponding monthly progress, ten-day progress control chart and visual progress chart for the details of the projects they control and manage, so as to clearly find the gap between the actual progress and the planned progress, understand the analysis reasons in time, and urge the construction unit to take remedial measures to synchronize the construction progress with the plan. 2.2 The network plan is used to supervise and control the progress of the project, because it is a scientific management mode, and it makes a scientific and systematic analysis and induction of various unfavorable or favorable influencing factors when preparing the network plan. This can be used to check the progress of the project at any time, grasp the changes of key lines, adjust, optimize and guide the construction plan in time. 2.3 The owner has a great influence on the implementation of the plan, mainly referring to policies and funds. Therefore, the supervision engineer should coordinate the relationship between the owner and the construction unit and try his best to provide favorable conditions for the implementation of the schedule. 3 Supervision and control of project cost The control of project cost is mainly realized by measurement and payment, and reasonable measurement and payment is helpful to project management. However, two tendencies must be prevented: first, advance payment; The second is deferred payment. 4. Vigorously promote the adjustment of the organizational structure of the supervision industry. The purpose of organizational structure adjustment of supervision industry is to rationalize the organizational structure of the industry. At present, the level of supervision enterprises is not clear, the big ones are not strong, and the small ones are not alive. The middle level needs to improve its quality and level. The scale and structure of supervision enterprises should be coordinated with the scale and structure of construction projects. Therefore, the key to the organizational structure adjustment of supervision industry is to solve the bipolar development of comprehensive large enterprises and specialized small enterprises. First, it will develop in the direction of enterprise groups or large enterprises that represent the level and strength of the industry, making it a large-scale backbone supervision enterprise that can compete with international consulting companies in China. Second, according to the development direction of specialization and miniaturization, by adopting diversified asset organization forms and management systems. Form a new type of supervision enterprise with unique characteristics, moderate scale, strong professionalism, flexible mechanism, small but specialized, small but refined, small and alive. Highway engineering supervision system has been continuously improved and improved in the process of highway engineering construction in China, and plays an increasingly important role in the development of highway construction in China. The steady improvement of highway construction quality in China illustrates this point.

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