With the regulatory economics and the multiprincipal theory, the behaviors of regulators through cooperative game and non cooperative game are analyzed, and the conclusion that the effective regulations demand cooperation of regulators is reached.

The paper summarizes the latest domestic researches on the principal-agent issue in supply chain and introduces the common agent theory which concerns multi-principals and one agent.

The paper concludes that: first,only when the firms solve the incompatible and noncoherence problem,they can get the best efficiency if there are multi-principal goals in the firms; Secondly,the best selection of managers is on the no market goal of.

An Designs of Incentive System of Engineering Supervision of Multi-task Principal;

In the light of status quo about the weakened incentive in hydropower project program management, this thesis researches the problem of how to improve incentive from multi-task principal-agent theory.