What are the main stages involved in the supervision work of the supervision unit?

Control the investment control, time limit control, project quality control and safety control of engineering construction; Information management and engineering construction contract management; Coordinate the working relationship between relevant units, that is, "four controls, two controls and one coordination". Construction project supervision can be divided into design supervision and construction supervision according to supervision stages. Design supervision is the supervision of the design project in the design stage, and its main purpose is to ensure that the design quality and time meet the requirements of the owner; Construction supervision is the supervision of the construction project in the construction stage, and its main purpose is to ensure that the construction safety, quality, investment and construction period meet the requirements of the owner. At present, China only implements project supervision in the construction stage, but not in the design stage. However, the municipal engineering and housing construction projects implement the construction drawing review system, which is equivalent to an elastic project supervision in the design stage, but it is also limited to these two engineering industries! The original intention of engineering supervision system is to replace the original micro-engineering management function of the government, but this goal has not been realized, and the government construction engineering quality supervision department is still implementing micro-engineering management activities; Another original intention is to provide professional services for the owners (construction units). The owner does not need to set up a special project management team, and this goal has not been achieved. The owner only authorized the engineering supervision unit to carry out procedural engineering supervision out of perfunctory laws, and the engineering supervision unit did not get enough authorization to complete the grand task of engineering supervision entrusted by laws and regulations! Due to the actual situation of fragmented management in China, the engineering consulting unit of the National Development and Reform Commission and the engineering supervision unit of the Ministry of Construction overlap, so only the two companies can work together, which also leads to the fact that the engineering supervision system in China cannot cover the whole process of the project!