[Objective] The slope protection and reinforcement effect of ecological slope protection model consisting of Cynodon dactylon and bamboo lattice as the main material on the slope of ion-absorbed rare earth mines by in-situ leaching were explored in order to provide a new idea for the stope slope control technology of rare earth mines in Southern Jiangxi Province.[Methods] Root-soil composite systems of C. dactylon and rare earth mineral sandy clay were used as the research object. The influences of root amount and water content on shearing strength were analyzed by direct shear tests. The effect of ecological slope protection mode of "bamboo lattice+C. dactylon" slope stability was analyzed by two-dimensional finite element method. The support parameters of spacing

length and diameter of bamboo piles were optimized by visual analysis method of orthogonal experiment.[Results] Plant roots could significantly enhance soil cohesion

but had little effect on internal friction angle. When root weight reached 0.5% or more

the shear strength of root-soil composite decreased

there was an optima root content. Root system had the most significant effect on soil reinforcement under 25% water content. The ecological slope protection model could significantly enhance the stability of slope. When the length of the bamboo pile was 3 m

the spacing was 2.5 m and the diameter was 8 cm

the protection effect was the best.[Conclusion] The reinforcement effect of C. dactylon root systems is different under different water content and root amount. The ecological slope protection mode of "bamboo lattice+C. dactylon" can effectively prevent the slippage of shallow soil of slope.