At present, China is constructing a new development format with domestic circulation as the main body and mutual promotion of domestic and international dual circulation. We must adhere to the strategic direction of supply-side structural reform, and twist the strategic basis of expanding domestic demand. China's engineering construction also needs to gradually innovate the construction model, starting from the project-level design, the business form is transformed from a single to a

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... ve service, and the business model is extended from BOT, PPP and other models to the integration of investment, construction, and industry. The "integration of investment, construction and business" model is an important direction for the transformation of engineering contracting enterprises. However, under the new situation, there are new opportunities and challenges in the construction of this model. The paper studies the current situation of China's investment and construction projects under the new situation and gives constructive opinions on its development.