Abstract: The approach of Cured-in-place pipe (CIPP) is an environmentally friendly trenchless rehabilitation technique that has been widely applied in the structural repair of pipeline. Under the action of surface loads such as traffic loads, the existing pipe joints or ring crack positions will be subjected to bending moments and rotate, causing concentrated stress in the inner lining and threatening the safety of the pipeline in service after repair. Existing studies typically assume a simple frictional interaction between the host pipe and the liner, neglecting potential bonding effects at the interface. To address this limitation, this study develops a three-dimensional finite element model that incorporates cohesive bonding between the liner and the host pipe, and evaluates the mechanical response of the system. The model is benchmarked against conventional friction-based models to highlight the influence of bonding interactions. Parametric analyses are conducted to investigate the effects of cohesive stress and of geometric variables on the stress distribution and on the debonding behavior. Research results indicate that higher cohesive strength leads to increased liner stresses. At the crown of the pipe, the axial stress initially stabilizes, then slightly decreases, followed by a localized increase near the critical debonding zone, where it reaches its maximum, and subsequently declines. The rate of stress reduction increases with cohesive strength. Additionally, the axial yield length of the liner grows linearly with pipe diameter. For a host pipe with an inside diameter of 500 mm, the maximum liner stress and the debonding extent are approximately 1.05 times and 3.2 times greater, respectively, than those observed in a pipe with a 200 mm inside diameter.