Based upon the idea that both facial appearance and functional outcomes of the craniofacial surgery need to be predicted in the pre-surgery planning stage, a CACSP system has been established. In this system, the input is in vivo CT/MRI scan data of patient with craniofacial deformity, anatomical restoration is simulated using the medical visualization packages ANALYZE, and the finite element analysis of the masticatory system has been integrated to predict the functional improvement such as bite force alteration. Preliminary studies in this laboratory have revealed the potential of this system.