This study compared progress of range of motion(ROM)outcomes between 3 weeks of immobilization(20 cases, 20 fingers)and modified Kleinert method(14 cases, 15 fingers)as postoperative treatments following surgical repair of flexor tendon rupture in ZoneⅡ. Both postoperative treatments were divided into outcomes by Strickland's evaluation method. As a result, both treatment methods showed an improvement to the extension of the proximal interphalangeal joint(PIP joint)and the distal interphalangeal joint(DIP joint). In addition, good recovery of the DIP joint was clearly observed in the modified Kleinert method, and the importance of single excursion of flexor digitorum profundus(FDP)was indicated. As above, we recommend that therapists promote active or passive extension exercise, and promote single excursion of FDP, if using the 3 weeks immobilization method, as soon as possible.