The authors observed the changing process of length, width and height of maxillary growth in experimental animals, the experimental animals were divided into the unoperated control group, the surgical induced cleft palate group, the repaired cleft palate group and the group of implanted autograft bone in total hard palate. The method of a serial dorsoventral and lateral cephalograms were used in the study. The experimental result showed: the rate of maxillary growth began to change from two to four weeks and finished in the eighteenth week after operation. There was a remarkable different rate of maxillary growth among the four groups. The track of premaxillary growth had a difference between unoperated control group and the others. The experimental result suggested that the direction of growth in nasal septal cartilage and the conduction of force from premaxillary to maxillary were inhibited. It is a main reason for maxillary growth disturbance of the cleft palate who had or had not surgery.