Residents' sense of happiness, gain and self-contentedness are important indicators for evaluating government work. Only the early development of happiness has a reasonable evaluation system, and the sense of gain and self-contentedness are new concepts with Chinese characteristics, theory and empirical researches are relatively weak. Based on the analysis of the existing literature, this paper explores the inner relationship between happiness, gain and self-contentedness based on the analysis of the basic concepts, establishes the concept of the conduction mechanism of happiness, gain and self-contentedness, and forms the connection mode among those.