The relatively weak link in the current construction project management is the project investment control. There is often a lack of accurate investigation beforehand and the lack of real investigation data, resulting in the lack of authenticity of the investigation report, and it is difficult to calculate the investment spent on the project. Engineering projects are prone to investment risks and cause unnecessary losses. Construction project investment is related to the future development trend of the construction industry. In order to adapt to the development needs of the society, this article discusses current engineering projects from the four key aspects of project investment control—optimized design, good bidding, scientific management, and strengthening of audits. There are problems in the investment process, and the corresponding investment control strategies are discussed. The research conclusions show that these four key aspects play a very important role in engineering project investment control.