Indoor model tests were used to compare and study the influence of the number of beaded Karst caves on the top horizontal tensile characteristics of the cast-in-places piles， so as to provide an experimental basis for the design of horizontal bearing capacity of embedded rock piles in Karst strong development areas. The results show that： 1） when the horizontal load at the top of the pile is the same， the horizontal displacement， pile bending moment （or peak value）， and pile side soil resistance of the upper soil section increase with the increase of the number of Karst caves， and the horizontal bearing capacity of the single pile decreases significantly with the increase of the number of Karst caves. 2） The horizontal displacement of the pile body in the upper soil section increases with the increase of the horizontal load on the pile top. The pile top horizontal displacement is the largest， and the embedded rock section is very small or even 0. The bending moment M-depth z curve is parabolic in shape， the pile bending moment at the soil-rock interface and the interface between the upper layer Karst caves and the base plate presents two peaks， the change of bending moment only affects the upper layer Karst caves and its base plate， and the bending moment at the second layer Karst caves and below is almost 0. The bending moment at the soil-rock interface is the largest， and the section is the most dangerous. The soil resistance p-depth z curve is a “convex belly” type. 3） As the number of Karst caves increases， the higher the location， the easier the p-y curve converges. The p-y curve for the soil section can be fitted using p/pub=α（y/y50）β. The influence of the number of Karst caves has little effect on the range of α and β values. The range of α and β values reflects the sensitivity of the p-y curve with depth and the sensitivity of both increases with the number of Karst caves. 4） To improve the horizontal tensile capacity of the single pile， when engineering piles pierce Karst caves， it is recommended to use the grouting method to improve the upper geotechnical properties， increase the reinforcement rate of the pile body at the soil-rock interface， and embed the pile body into the upper Karst caves floor to a certain depth so as to prevent the foundation pile from bending damage at the soil-rock interface.