As a typical knowledge-intensive service, knowledge process outsourcing (KPO) has gradually recognized by society and showed a rapid development momentum. The success of KPO activities depend on effectiveness of knowledge transfer. This paper describes the concept, characteristic and content of knowledge transfer in KPO, analyzes the process of knowledge transfer; and puts forward a model of knowledge transfer in KPO from three levels: organizational-level, team-level and individual-level; finally it discusses some influence factors of knowledge transfer.