Background: Repeated ankle sprains among young and adult athletes are a common cause of chronic ankle instability (CAI). Objective: This study purpose to compare two methods of proprioceptive training, one with visual biofeedback and one without visual biofeedback, to evaluate their impact on postural control and ankle joint position sense in athletes with CAI. Method: This research was semi-experimental and applied, the sample of the current research was 30 male athletes (age 22.9 ± 1.32 years, height 1.8 ± 0.04 cm, weight = 70.6 ± 9.19 kg, BMI = 20.9 ± 2.10) with chronic ankle instability from sports Futsal, volleyball and handball were selected as accessible and purposive sampling. Subjects were randomly divided into two groups: proprioceptive training with visual biofeedback (PTB) and proprioceptive training without visual biofeedback (PT). Then, in the pre-test, they were evaluated by using tests to restore the ankle joint position sense by a universal goniometer, dorsiflexion, and plantarflexion, and check postural control with the tests of the balance error scoring system (BESS) and the Y balance test. Then, the athletes performed proprioceptive training during 24 sessions during eight weeks, and at the end of the post-test evaluations, re-measurement was performed. ANCOVA analysis was used to analyze the data. Data were calculated using SPSS version 27 software with a significance level of P≤0.05. Result: Comparison of the two groups using ANCOVA showed that proprioceptive training with visual biofeedback compared to proprioceptive training without visual biofeedback on dorsiflexion proprioception of athletes\\\' ankles Reconstruction angle difference by degree (P=0.028) and plantarflexion proprioception of athletes (P=0.013) and Static posture control by Number of errors (P=0.012) and dynamic posture control in anterior by centimeter (P=0.001), posterior-internal by centimeter (P=0.030) and posterior-external by centimeter (P=0.001) directions are more and better. Conclusion: Based on the findings, It can be stated that the PTB program has a better effect than the PT program on proprioceptive components and postural control, and when proprioceptive training is combined with visual biofeedback, athletes can use images to improve their performance and correct their movements. This method can help athletes improve their movements and perform better

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