Project manager's management and innovation ability directly affects and determines the project quality, safety, efficiency and cost. If the project manager lacks the basic operation and management quality, it will inevitably lead to the risk of project construction loss: too frequent replacement of the project manager will also lead to the disadvantage of uncontrollable construction cost. For example, in the construction of a highway tunnel, the project manager changed five times, and the outgoing audit work was not in place, resulting in unfavorable connection, disputes before and after, uncontrollable cost, and large capital deficit in the later stage of the project.