Abstract：The effectiveness of prestressed anchors strongly depends on the level of combination of anchors and rock. Defects，which will affect the strength of the prestressed anchor reinforced slope, are inevitable on the interface between anchors and rock. There exist some misunderstandings on the distribution of stress fields in the proximity of the interface in design and computation analysis in the present literatures. A pullout model is set up in this paper and the fracture theory is employed to analyze the singular stress fields in the proximity of the interface ends. The results show that the shear and normal stresses are singular near the two interface ends (outer and inner), and the singular stresses may result in fracture damage there，so it is unreasonable for the equilibration stress method to ignore such damage. The results may directly be used to detect and control engineering construction，and can also provide instructions to the design of prestressed anchors of soil-rock slope.
