Abstract: Objective: To understand the differences between occlusal contact features in different populations and investigate the influence of orthodontic treatment on occlusion contact features. Methods: Selected 20 individuals with normal occlusion(group A), 20 individuals with malocclusion(group B), 30 individuals of post orthodontic treatment(group C), evenly distributed between male and female. Tee-Test occlusion analysis system was used to detect the full occlusal contact area, total of force(TOF), force per unit area, asymmetry of force (AOF), center of force(COF), the percentages of the single teeth in dentition. Results: TCA,TOF value were significantly higher in group A (P<0.05). Group C showed lower value of the force per unit area and higher value of COF, AOF than group A, and group B showed significantly difference between two groups(P<0.05). The maximum bite force area was distributed in the second molar area in group A and B, but changed to first molar area in group C(P<0.05). The gender differences in occlusion contact features showed no significant difference in three groups. Conclusion: The function and stable of occlusion after orthodontic treatment showed better results compared to malocclusion but the results were not as positive as the individual normal occlusion.