Abstract: We presented a new motion reuse method.The displacement mapping was used to reconstruct a constrained trajectory for the target character,where the characteristics of the original motion are well preserved.Then based on the constrained trajectory,a real-time unscented Kalman filter solver was applied to generate a new motion similar to the original one.Experimental results show that our method can generate realistic motions suited to different characters and scenes,and consequently extend the reusability of motioncaptured data.