Abstract: The non-homogeneity and discontinuity of the height of spheroidal weathered granite type soil slopes and the complexity of the soil-ball contact interface cause their instability damage to be complex and variable. The failure mode of spherical weathered granite-like soil slopes is studied taking into account the action of content,spatial distribution,grain size composition and soil-sphere contact surface. The results show that the damage pattern of spheroidal weathered granite slopes is complex and variable. The presence of spheroidal weathering bodies makes the potential sliding surface of these slopes extremely irregular,and even multiple sliding surfaces appear. The weathered bodies located near the sliding surface hinder the development of the sliding surface,forcing the plasticity of "rock-winding,diversion or inclusion". As the content of spherical weathered bodies grows,it is more and more difficult to form a single sliding surface inside the slope body,and the safety factor gradually increases. The more the content of (0.22~0.3)L_c size weathering bodies,the larger the area occupied by the weathering bodies in Zone Ⅱ,the more favourable to slope stability. The soil-ball contact interface is most likely to develop into a sliding surface,and the interface contact type significantly affects the sliding surface of spherical weathered. The interface contact type significantly influences the destabilization evolution process of granite-like soil slopes. The research results can provide scientific basis and theoretical support for evaluating the stability of spheroidal weathered granitic soil slopes reasonably and accurately.