Objective To reveal the biomechanical mechanism of suspension exercise therapy (SET) for treating cervical spondylosis. Methods From August 2015 to December 2016, 72 patients with cervical spondylosis were divided into experimental group (SET treatment group) and control group (traction treatment group) based on simple random sampling methods. For experimental group: 9 males and 27 females, the average age (45.19±10.09) years old, the average disease course (24.94±18.07) months. For control group: 11 males and 25 females, the average age (44.08±8.88) years old, the average disease course (22.17±14.96) months. The mechanical properties of neck muscles before treatment and at the end of disease course were tested by Biodex Ⅲ Isokinetic Testing System. Results Before treatment, there were no significant differences in the peak torque (PT), average power (AP), peak torque of flexor/extensor peak torque ratio (F/E) for both groups; after treatment, PT, AP, F/E in experimental group was improved compared with those in control group (P<0.05). Significant differences in PT, AP, F/E were found for experimental group before and after SET treatment(P<0.05). There were no significant differences in visual analogue scale (VAS) of neck pain for both groups before treatment (P＞0.05)，while the VAS of experimental group was better than that of control group(P<0.05). Significant differences in the VAS were found for experimental group before and after SET treatment(P<0.05). Conclusion sSET can improve the contraction forces and work efficiency of neck muscles for patients with cervical spondylosis, as well as the coordination ability of flexors and extensors muscles, which will contribute to restoring biomechanical properties of the patients with cervical spodylosis.