Objective To explore the reliability of ultrasonic sound touch elastography of measuring the elasticity of brachial plexus roots in normal people, and further analyze their characteristics. Methods The sound touch elastography technique was used do repeated measurements for the elasticity of the bilateral C5, C6 and C7 nerve roots of the 44 healthy volunteers enrolled twice in this study. The two times measurements were summarized and used for evaluation of intra-rater reliability and minimal detectable change. Selected one of the two test results randomly from all subjects, and summarized for comparative analysis of characteristics and influencing factors related to elasticity of brachial plexus roots. Results The nerve root elasticity values of C5, C6 and C7 on the left and right sides of the normal population were 20.64±6.87/21.34±5.35/25.48±7.13KPa and 20.19±7.86/22.35±7.99/24.61±8.15KPa, respectively. The internal reliability of the evaluator for the C5/C6/C7 nerve root elasticity measurement in the left and right side of the normal population using the Resona7 ultrasound system was 0.70/0.63/0.74 and 0.68/0.60/0.71, respectively, and the corresponding minimal detectable change was 21.01/18.16/20.02 and 24.79/28.09/24.36KPa. Further data analysis of the combination of both sides showed that the elastic values of C5, C6 and C7 were 20.41±7.34/21.85±6.78/25.03±7.58KPa, which showed a significant increasing trend (P<0.01). There are significant statistical differences between the three pairs (P<0.01). Conclusions Sound touch shear wave elastography has a certain reproducibility and good reliability in measuring the elasticity of C5-C7 brachial plexus roots in normal people. Considering that the minimal detectable change obtained in this study is high, it should be fully considered when using this technique for quantitative assessment of disease changes or treatment efficacy.