Abstract: The creep characteristics and damage properties of interlayer shear belt of high abutment slopes affect the long-term stability of high dam projects. The shear creep mechanic characteristics of interlayer shear belt are studied based on the shear creep mechanic test, and the long-term shear strength parameters, accelerated creep properties and change rules of shear creep rate are analyzed. By analyzing the rules of creep damage evolution of interlayer shear belt, the damage degradation effects of mechanical parameters over time and over accelerated creep are discussed. Based on the Nishihara creep model and the creep damage evolution equations, a creep damage model is proposed to reflect the creep damage process of interlayer shear belt of slopes completely. The comparison between the calculated results of creep damage model and the test results show that the proposed creep damage model for interlayer shear belt of slopes is available and reasonable.