The necessity of taking government as the implementing subject in the construction of new countryside was analyzed from the aspects such as narrowing urban-rural gap, government’s responsibility, connotation and complexity of new countryside construction. Dynamic mechanism of government in the construction of new countryside was discussed, and some problems were introduced. The basic reason of these problems was the deficiency of government’s publicity. Firstly, self-interest of government led to the deviation of public target. Secondly, government was controlled by superior groups, thus benefits of vulnerable groups can’t be ensured. On this basis, establishing an incentive and constraint mechanism for government officers was put forward. It was essential to make full play of government’s self-interest, establish a scientific system and mechanism for assessing political achievements, regulate government’s behaviors and implement extensive socialization supervision of public rights.