Abstract:The paper summarizes the factors influencing the efficiency of knowledge transfer in inter-project learning, establishes a systematic dynamic model of knowledge transfer efficiency of inter-project learning, discusses the influence of direct factors and complex factors such as network communication and project relationship on the efficiency of knowledge transfer. Taking the process of air pollution control in Beijing-Tianjin-Hebei as a sample, the governance project acts are simulated to measure the change of knowledge transfer efficiency. The main conclusions are as follows: (1) in the process of knowledge transfer of inter-project learning, the efficiency of knowledge transfer gradually increases, and the active factors play a leading role. (2) In the late stage of knowledge transfer, it is the stage of transformation ability and development ability in knowledge absorption process, and the key time for network communication to affect the efficiency. Higher knowledge transfer efficiency will directly improve the intensity of network communication and form positive feedback. Tighter inter-project relationship increases the intensity of transfer landscape and thus improves the efficiency of knowledge transfer. The close direct relationship of business department hinders the knowledge transfer, which represents too much interference in the process, and the state of benefit is to keep more loose relationship. (3) empirical study shows that the united governance mechanism in the air pollution control project in Beijing-Tianjin-Hebei area represents the best level of knowledge transformation. The factors such as transfer landscape, transfer media, knowledge increment of both sides and social network have the most significant effects on the process of knowledge transfer.