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Based on the geological conditions of the anchorage for a suspension bridge, it is proposed to calculate the value with theoretical methods. The Hoek-Brown solution, Bell solution and the modified Hoek-Brown solution are respectively used for comparative analysis based on the side loading effect of overlying rock and soil within the buried depth of the foundation base and the confining pressure effect of surrounding rock mass in the passive area, so as to obtain the theoretical solution of the bearing capacity of the bearing stratum of the project. In order to evaluate the difference between the above-mentioned standard solutions and the theoretical solutions and the measured values, a total of 6 groups of bearing capacity measurement tests in the bearing stratum of deep rock mass were carried out based on the East and West anchorage sites of the suspension bridge. The test results show that the characteristic value of the bearing capacity of the moderately weathered mudstone in the West anchorage and the characteristic value of the bearing capacity of the moderately weathered argillaceous sandstone in the East anchorage of the bridge are 2131 kPa and 2461 kPa respectively, which are significantly higher than the recommended value calculated according to the shallow foundation method in the current specification, and are closer to the modified Hoek-Brown theoretical solution, which provides a reference for the design and value selection for the bearing capacity of the bearing stratum of similar projects. [ABSTRACT FROM AUTHOR]