Abstract: Focusing on the anti-floating design problem of the basement in a project,five uplift piles with 0. 7 m and0. 8 m in diameter were adopted to conduct field tests to investigate the uplift bearing capacity of rock-socketed piles in the weathered tuff layer. The test results show that all the test piles are slowly deformed when loaded to the design value,and the maximum displacement is 6. 92 mm ～ 10. 67 mm. In the test,the shaft resistance of the rock layer is not fully utilized,and the safety factor is relatively large. The ultimate uplift bearing capacity of 5 test piles is calculated by different domestic and foreign standard methods. It is found that the ultimate uplift bearing capacity of rock-socketed piles obtained by theoretical calculation is generally greater than the design value,and the foreign AASHTO method and the Canadian Geotechnical Engineering Manual are both larger than the building pile foundation code,and the greater the length of the rock-socketed section,the more significant the difference in calculation results. Both experiments and theoretical calculations show that the ultimate shaft resistance of the middle-weathered tuff rock-socketed section has great potential and can be used as a good bearing layer for uplift piles.