This paper is based on the theory of no-boundary management, supported by block chain technology, and analyzes the obstacles to the advancement of the no-boundary smart government affairs, from the aspects of breaking the cooperation boundary of vertical information, horizontal information, internal and external information and regional information of smart government. This paper explores the promotion mechanism of no-boundary smart government affairs. This paper constructs the model of advancing mechanism of no-boundary smart government affairs based on information synergy, analyzes the case of“e-Estonia”,and gives some propose on the development of no-boundary smart government affairs.