Knowledge transfer scenario influences the efficiency of knowledge transfer. This paper proposes a scenario model of knowledge transfer for evaluating the efficiency of external technology and knowledge retrieval. The scenario model includes two parts. One is the relation between knowledge resource and knowledge destination, including relation scenario, management scenario, and environment scenario etc. Scenario similarity is proposed for evaluating the feasibility of technology and knowledge transfer in this part. Another is activity scenario and technology scenario. Experts evaluate the infection of this part to knowledge transfer. And then, integrated evaluating result is supplied. At last, an example is offered to validate the availability of this method.