Abstract: The influence of batholith on the vertical pulling bearing capacity of rock-socketed piles is studied. The test results show that the extension of stress and the angle between fracture-sections depend on the strength and integrality of batholith. The higher is the strength ratio of piles to batholith, the more uniform is the shear stress distribution on their interfaces. The displacement is the control index of pile design if the strength of batholith is much less than those of the piles. Failure of a pile depends mainly on the distribution and characteristics of rock discontinuities, and under this condition, the anchorage section should be placed at middle or lower parts of the piles.