The composite structure of row posture micro-piles,as a light-weight protection structure in sideslope protection,has the advantages of safe and quick construction and high adaptability to some special environments.A basic requirement of the elastic foundation-beam theory application is that the foundation shouldbe stable.Because the row posture micro-piles composite structure improves the stability of slope,the resistant forces in front of different positions of micro-piles are different.On the basis of the elastic foundationbeam theory and by using the idea of the general micro-piles horizontal bearing capacity calculation method,the row posture micro-piles advantages are revealed by the different calculated m(the coefficient of rock resistance)values and the limited conditions of pile top large deformation.The computational formula of rowposture micro-pile composite structure is established from three basic calculation models.The special response to seismic force is calculated and analyzed in a practical case,which may provide certain reference forthe micro-piles design.