Abstract: Micro-implant anchorage is an effective method to enforce anchorage during orthodontic treatment of convex profile, which has been used widely. Because micro-implant anchorage is able to achieve an effective result which traditional anchorage can notachieve,more and more orthodontists choose micro-implant in clinic. Recently,many domestic and foreign scholars do a lot of studies about application,advantages and disadvantages of micro-implant anchorage. Many valuable results have been got. This article reviews the indication and stability of MIA, the comparison of retraction and intrusion of anterior teeth with traditional anchorage, the effect of retraction and intrusion of anterior teeth and the development of micro-implant, thus cleaving a promising prospect for MIA.

Key words: micro-implant, intrusion and retraction of anterior teeth, convex profile