Objective To investigate the value of ultrasonic measurement of glenohumeral joint capsule thickness and hardness in the evaluation of frozen shoulder treatment. Methods A total of 68 patients with FS admitted to the Fourth People's Hospital of Zigong City from June 2021 to August 2022 were collected. They were divided into three stages according to clinical characteristics. All patients were treated with ultrasound-guided injection combined with hydraulic release of the joint capsule. Shoulder joint evaluation was performed 1 day before treatment and 2 weeks after treatment. Constant-Murley (CMS) score and shoulder motion were used for clinical evaluation. The thickness and hardness of the glenohumeral joint capsule were measured by ultrasound, and the correlation between the two evaluation methods was analyzed. Results After treatment, the ultrasonic measurement values of joint capsule thickness and hardness were decreased (P<0.05). The Constant-Murley score and shoulder mobility were elevated (P<0.05). There was a negative correlation between the improvement values after and before treatment.Conclusion The thickness and hardness of glenohumeral joint capsule were measured by ultrasound to evaluate the treatment effect of frozen shoulder. The measured values are correlated with clinical scores, and the evaluation results are consistent. The evaluation method is more objective and have clinical diagnostic value