A new handwriting model is proposed for simulating complex handwriting variation in obedience to individual handwriting tendencies. Individual handwriting t,endency is represented as a set of deformation rules each of which deforms one structure of pen movements. Characters are represented as hierarchical descriptions of pen movements, so that deformation rules for various types of pen movements structure can be easily and uniformly applied to characters. Several writers' handwriting of Kanji characters have been simulated using this model and the experimental results demonstrate t.he capability of this model.