Objective To report the method used to treat knee joint contracture by static progressive stretch and evaluate its curative effect. Methods Sixteen patients with knee joint contracture after the orthopedic surgery were selected，including 2 femoral shaft fractures, 5 distal femur fracturs, 4 patellar fractures, 5 tibial plateau fractures. The average course of postoperative treatment was 13.7 weeks. Static progressive stretch (SPS) was applied by isokinetic dynamometer, with 5 sets of stretch in one direction for one treatment, each set lasts 5 minutes with 1 minute interval for rest, and the degree of joint position was increased progressively for the next set. Patients received SPS 2 times per day, 30 minutes per time, 5 days per week, and the course of treatment lasted 2 months. The knee flexion degree (F), extension degree (E) and range of motion (R) were measured by goniometer before treatment, after treatment, 6 months after treatment, respectively. Results E, F and R of the knee joint were improved significantly both after treatment and 6 months after treatment as compared with those before treatment. Conclusions Application of isokinetic dynamometer by static progressive stretch can be used to treat knee joint contracture effectively.