Abstract: ［Abstract］ Objective：To investigate the clinic application of the treatment of maxillary protrusion malocclusion with micro implant anchorage. Method ： 32 patients with maxillary protrusion were divided into two groups randomly with 16 patients in each group, whose ages ranged from 18 to 25 years. All patients were treated with extraction. Micros crew palatal implant was used in the cases of experimental group as orthodontic anchorage，and traditional anchorage composed of extraoral arch used in the control cases. The cephalometric films before and after treatment were measured , Statistical methods were utilized to analyze the morphological changes of facial profile and hard tissues in both groups. Results：The　 U1-NA(mm) and U1 – SN(o) average after treatment were less than that before treatment in the experimental group（P<0.01）and the controls group（P<0.01）, and U1 - L1(mm) average after treatment were more than that before treatment（P<0.05）in the experimental group（P<0.05）and the controls group（P<0.05）. The U6-PtPNS(mm) average after treatment were more than that before treatment（P<0.01）in the controls group Conclusion：Treatment of patients with maxillary protrusion need with strong anchorage, can be used implants palatal side micro screw type .

Key words: orthodontic anchorage, microscrew implant, maxillary protrusion