Abstract：The long-term performance of prestressed rock cables constitutes an important aspect of stability of the reinforced slopes. Based on analyzing the factors affecting the load variation in long-term，the variation law of prestress load is obtained，and prediction model is also developed. Monitoring data show that the load variations with time can be described as three phases. Phase I，lasting about 3～6 months，includes instantaneous losses of load during the lock-off operation. Phase II may take several years，in which load fluctuates. In phase III，the load is losed with uniform rate in long time. The main factors affecting the long-term performance of prestress rock cables are rock deformation，steel fiber relaxation and temperature change. The presented prediction model has been applied to practical engineering and good agreement is obtained with field monitoring data.
