Analyzing the status of team development can help to evaluate team current state and development process and provide necessary decision supports for team building． This paper，from the perspective of knowledge，shows that transactive memory system ( TMS) can be used as a team knowledge representation，and proposes a method to analyse team development based on TMS． Firstly，according to a member’s knowledge structure，especially differentiated knowledge in his transactive memory，a member’s transactive memory-differentiated knowledge model (TM _ DKM) is proposed． Secondly，a transactive memory system model (TMSM) is proposed by integrating all members’differentiated knowledge． Then，an analytical method of team development status based on TM_DKM and TMSM is put forward． Finally，a case study is given to validate our model and method． Our method can be used to study innovation teams including their state and development process evaluations as well as problem diagnosis，such as innovative teams in the ministry of education，national innovative groups，and so on．