Abstract: To improve the post-editing efficiency of the synthesized facial animation,this paper proposes a spacetime-based method to edit the facial animation.It propagates the users' editing among the input facial model with the Laplacian-based mesh deformation,which can preserve the details of the initial facial model and guarantee the reality of the synthesized expression.Then,a Gaussian function is employed to propagate the editing effect to the surrounding frames in a fast way.The approach retains the high consistency between the edited facial animation and the original facial animation during the propagation.It provides users with the local control of the facial animation editing.Users can assign the influence range of their editing and the editing result is propagated to the surrounding frames naturally.Experimental results show that our approach can generate natural and realistic facial animations.It can efficiently improve the editing efficiency for the data-driven facial animation.