The aim of this research was to examine the effects of 8-weeks core stability training on stable and unstable surfaces on ankle muscular torque, proprioception, and dorsiflexion range of motion (ROM) in athletes with chronic ankle instability (CAI). In this semi-experimental study, thirty athletes with CAI the age range of 18-30 years were participated in this study. The participants were intentionally selected and assigned randomly into three groups 10 people, unstable surface training (UG), stable surface training (SG) and control (CG). UG and SG performed the core stability exercise protocol. One-way ANOVA and Holm-Bonferroni post hoc test were used to evaluate the data (p≤0.05). Findings showed that in all measured parameters, the UG was significantly different from the SG and CG (ps≤0.026). The results also showed that the SG had a significant improvement in the parameters of muscle torque and dorsiflexion range of motion compared to the CG (ps≤0.022), But in the proprioception there were no significant difference between in the SG and the CG (p=0.54). According to the results, it can be concluded that performing core stability training on Trampoline surface has a more effect on improving the measured parameters in athletes with chronic ankle instability. Therefore, it is recommend to perform these exercises as a training intervention for people with chronic ankle instability.