The paper proposes the main problems that arise in investment control of agency construction projects through engineering practice, and explores the root causes before providing solutions. For: urging users to establish investment control awareness; The key stage of investment control is the design phase, where measures such as scheme optimization and quota design are taken to reverse the passive situation; The measures taken to prevent malicious low-priced bidders from being shortlisted or winning the bid were emphasized. Investment control measures should focus on active control, prior control, and feedforward control to achieve twice the result with half the effort!