Abstract: The existing method and theory for determining the horizontal bearing capacity of rock-socketed pile, including subgrade reaction method and elastic continuum method were summarized and analyzed. The results from different methods were compared based on the in-situ test data, and the validity and limitations of the different methods were discussed. The results show that the accuracy of subgrade reaction method depends mainly on experience. The linear elastic subgrade reaction methods of constant method and Matlock method with single parameter are relatively simple, but it is difficult to determine the parameters for rock-socketed pile in the absence of field test data. The p-y curve method is more suitable for the pile with large deformation because it reflects the nonlinear reaction of foundation. However, the p-y curve method proposed by Reese overestimates the stiffness of the rock mass, and the validation of the p-y curves for rock-socketed pile is still inadequate. In the elastic continuum method, the continuity of rock is considered, but it is difficult to include the complex effects in practical engineering.