Abstract: Rock-socketed piles are widely used in geotechnical engineering to bear lateral load. However, it is still difficult for us to accurately analyze its lateral bearing capacity. We established a numerical simulation model of rock-socketed piles under the lateral load by using FLAC^3D, and compared the simulated results with the measured results. Due to the high coincidence degree between the two results, we further analyzed the influence of rock mass parameters(elasticity modulus E, cohesion c, angle of internal friction φ), pile diameter, outcrop height, socketed depth and pile concrete strength on the lateral bearing capacity of rock-socketed pile. The results show that the increase of rock mass(E, c, φ) can increase the lateral bearing capacity of pile. E affects its lateral bearing capacity at the beginning of the force, and c, φ has an impact after the rock mass enters the plastic stage. Pile diameter has a significant influence on the lateral bearing capacity of pile. There is a critical value for the impact of socketed depth. When the socketed depth exceeds 3 times of pile diameter in this simulation, the lateral bearing capacity of pile increases slowly. The increase of pile concrete strength can enhance its lateral bearing capacity, but the effect is not obvious. The increase of outcrop height reduces the lateral bearing capacity of pile. Based on rock mass and pile body, this paper overcomes the lack of comprehensive selection of influencing factors in the past, and the results can provide reference for the design of rock-socketed piles in future projects.