According to different levels, it can be divided into: (1) macro investment decision. From the perspective of the overall balance of the national economy, the process of making decisions on the investment scale, investment use direction, capital construction layout, key construction projects, investment system, investment control means, investment policy and investment environment improvement that affect the overall economic development. Macro-investment decision-making directly affects the sustained, stable, coordinated and efficient development of the economy and plays an important role in the whole macro-economic decision-making. Its mistakes are often the most direct reason for the ups and downs and adjustments of the national economy. (2) Micro-investment decision. Also known as "project investment decision", it refers to the final decision on the proposed project on the basis of investigation, analysis and demonstration. Project investment decision-making involves the analysis, demonstration and selection of construction time, place, scale, technical feasibility and economic rationality, which is the primary link and key factor of investment success or failure. Micro investment decision-making is the basis of macro investment decision-making and plays a guiding role in micro investment decision-making.