Abstract: In order to improve the bonding performance and construction efficiency of joint surfaces in monolithic precast concrete structures, a mold forming joint surface is proposed. The results indicate that all the specimens show typical shear failure characteristics. Among the three molding methods, the washed exposed aggregate joint surface has the highest shear carrying capacity, followed by the molding and chiseled joint surfaces. The difference in shear carrying capacity between the molded and washed exposed aggregate joint surface is 1.56%. Before reaching peak load carrying capacity, the contribution of reinforcements in the joint surface is minimal. The interfacial shear load carrying capacity is primarily dependent on bonding strength, aggregate interlock, and friction. After reaching peak load carrying capacity, the reinforcements yield, and the dowel action and shear friction predominantly contribute to interfacial load carrying capacity with the continuous increase in the relative displacement of the joint surface.