Abstract: In the process of rapid economic and social development, government investment projects are an important force in promoting industrial upgrading, improving infrastructure, and enhancing social livelihoods. However, some projects have problems such as insufficient implementation of plans and disconnection from reality, which have hindered the progress of the projects. Therefore, strengthening project planning and demonstration, and ensuring feasibility have become important issues that urgently need to be addressed. This article proposes that project planning and demonstration should be based on national economic and social development plans, special plans, and industrial policies, and comprehensive implementation plans should be formulated for different industries and fields. The project management department should strengthen overall planning, conduct in-depth analysis of the current construction situation, identify problems and shortcomings, clarify recent construction goals, funding requirements, and project lists. At the same time, the implementation plan adopts a rolling evaluation and regular revision mechanism, and dynamically adjusts to achieve precise connection with financial security. Research has shown that scientific planning, argumentation, and implementation plan formulation can significantly improve project feasibility and implementation, ensuring rational allocation of resources and efficient use of funds. From this, it can be seen that strengthening project planning and argumentation, building a sound implementation plan formulation and dynamic adjustment system are important paths to ensure the feasibility of government investment projects, and have significant implications for improving investment efficiency and playing a leading role in government investment.