Abstract: Based on the achievement of the predecessors' research on micropiles, supporting system of the micropile horizontal resistance function is studied through the laboratory test. It is pointed out that the horizontal resistance force can be ignored and the rigid joint or hinged joint concrete beam are fixed on pile top in order to improve the slippery body of anchorage force and reduce sliding body deformation. Through the analysis of the model, the passive anchorage mechanism about landslide reinforcement of micropiles was discussed, and the calculation formula of the anchoring force under the control of the strength of steel was deduced. And the micropile anchor is compared to the anchor rod (cable), it is put forward that the length of anchoring section should be more than 6 m in rock formation and 8 m in the soil layer. The anchorage force depends on the smaller one between "C" which is determined by material strength and "T_u" which depends on the stratus condition. In the end, the feasibility of micropile control of the landslide and the reliability of the calculation method through an engineering example have been proved.