【Objective】The aim of this study is to uncover the bonding mechanism between ribbed steel bars and high-strength cementitious soil. Thirty-three cubic pull-out specimens with dimensions of 150 mm×150 mm×150 mm were produced using an existing cementitious soil solidifier ratio.【Method】Through direct pull-out tests, the influence of anchorage length, cementitious soil cover thickness, and steel bar diameter on the bonding performance between steel bars and cementitious soil was analyzed.【Result】The experiments indicate that the bonding strength at the interface between steel bars and cementitious soil decreases with the increase of anchorage length. The optimal cover thickness for steel bars and cementitious soil is between 2 to 3 times the diameter of the steel bar.【Conclusion】As the diameter of the steel bar increases, the impact of the diameter growth on the bonding strength decreases, especially when the diameter exceeds 10 mm.