Prof Maskin’s most prominent contribution is the introduction of game theory into the design of mechanisms. Before him, the most important scholar of mechanism design was Leo Hurwicz. The mechanism design was only considered from the perspective of the central planner. Dr. Maskin believes that a central planner is not needed. As a master economist in the field of game theory, Dr. Maskin represents the metaphysical value orientation of economic theory. In 1977, Dr. Maskin completed the paper "Nash Equilibrium and Welfare Optimization" - although after 22 years It was officially published (1999 Economic Research Review) and became a milestone in the theory of mechanism design. In this paper, Dr. Maskin proposed and proved the sufficient and necessary conditions for the implementation of Nash equilibrium. The countermeasures he constructed when he proved sufficient conditions were called “Maskin's countermeasures” and were widely circulated.