Abstract: The quality of elderly care services is related to the health and safety of elderly users, which has become an important problem that needs to be solved urgently in China. In order to explore the effectiveness of feedback of the elderly users on the quality control of elderly care services, this paper takes the service quality of private elderly care institutions as the research objects, adopts the multi-group evolutionary game theory, and establishes a tripartite game model of “private elderly care institution-third-party evaluation agency-government supervision”on the basis of the feedback mechanism of the elderly users. Through the model derivation and the Matlab software simulation, it analyzes the evolution process of the optimal equilibrium point of the three parties in the game and the influence of the change of the “perceived value” of the negative feedback from the elderly users on the behavior strategy of the game subjects. The findings show that the “perceived value” of the negative feedback from the elderly users is an important factor affecting the realization of the “ideal”strategy of the three parties in the game; the greater the perceived value of the negative feedback from the elderly users by the private elderly care institutions and the third-party evaluation agencies, the more they will care for their reputation and the moreself-disciplinedthey will become. Therefore, to establish and improve the feedback mechanism for elderly users by the government can not only restrain private elderly care institutions and third-party evaluation agencies from rent-seeking violations, but also help private elderly care institutions to better understand the needs of elderly users, thereby improving the quality of the elderly care services.

Key words: the feedback of the elderly users, perceived value, elderly care service, tripartite evolutionary game