Abstract: Skeleton sub-space deformation (SSD),a popular technique in industry,has fatal defects known as collapse and pinch.In this paper,we present a new algorithm,named free form deformation (skinning) based on bone vertices string.By the method,we first reconstructure the model,combine the skeleton with the skin vertices,and then substantiate the virtual skeleton as strings of bone vertices. Particularly,we firstly compute the new coordinates of the bone vertices and then compute those of the skin vertices.The experiment shows the effectiveness of this algorithm in creating realistic skin for animated characters.