The conception of type transformation of plana, Assur Groups has been developed in this paper. The new type transformation of Assur group is based on that you may remove two types of kinematic chains from the group to form a tranfferred Kinematic chain.

• 本文扩展了杆组型转化的概念,提出了在杆组中解除两种状态的运动键的约束,使杆组得到型转化。