1. Start functional exercises from the day the cast is removed. First, active flexion and extension activities should be performed for two weeks. The so-called active flexion and extension activity is to use the affected limb’s own strength to do flexion and extension activities. The force starts from light to heavy, and the maximum force can be used at the end of two weeks. The purpose of active flexion and extension activities is to strengthen the forearm muscles, move the stiff joints, and loosen the adhesions formed when the tendon rupture point heals through the activities. Active activities cannot be performed with other forces. It is also important to protect your fingers from injury when you are not active, so as not to scrape your fingers on other objects. 2.At the beginning of the activity, the fingers will not move, as if the fingers do not obey, but persist, you will find that there will be progress every day. Do flexion and extension activities, each to a direction of force, to feel pain, and persist in this state for more than half a minute, can be repeated to do, every day in multiple groups, at least four times a day morning, noon, night and before bed, each time more than an hour. Focus on quality not quantity! Before the event, such as soaking the injured hand with hot water for fifteen minutes, the effect will be better. Pay attention to prevent burns. The limbs should become swollen after the activity, which is normal. 3, the daily practice, first of all, to consolidate the previous day’s results, followed by a further. Specifically described as, first to adapt to the pain overcome the previous day, and then challenge the new pain. Only in this way can we get good results. Too conservative and you may be delayed; too aggressive and you may pull the tendon out. In reality, it is very difficult to accidentally rupture a tendon when you follow the normal method. The two-week period of active functional exercises is boring, painful and energy consuming, and it is not easy to do well. 4. In milder cases, after two weeks of active flexion and extension exercises, more than 50% functional recovery can generally be obtained. However, for heavier cases, passive functional exercises are also needed. The so-called passive functional exercise is to use external force to passively flex or straighten the joint to loosen or break the adhesion band of the proximal tendon. For example, using the other hand or another person’s hand, or a traction support. Injuries to the flexor tendons (for example, in the wrist), by passively straightening the finger joints, the tendons are pulled toward the fingertips, while pulling in the opposite direction can only rely on continued, stronger active activity; injuries to the dorsal tendons, by passively flexing the joints, the tendons are pulled toward the fingertips, and pulling in the opposite direction also relies on active activity. 5.Passive functional exercises usually start from the seventh week. Cases that require passive activity are heavier, involve multiple fingers, and are operated finger by finger. Although the tendon should normally be fully healed by six weeks, it is still strictly forbidden to flex or straighten the fingers at once with violent force. Each force should be applied at a resistance for half a minute, when the patient should and must feel pain, otherwise the force may not be sufficient. The force used is progressive each day. A breakthrough sensation may be felt at one time, and as long as the finger can still move actively in the other direction, it means that the tendon is not broken, but the adhesive band is completely pulled. 6. Doing passive activities for the patient is a tiring task and the patient may also feel pain due to the pain, but can only persist. Passive activities cannot replace active activities. All functional exercises, for patients with unilateral injury, should be done for three months. Soaking the hand in hot water before activity is more effective. It is normal for the swelling of the injured hand to increase after activity. Traction brace can reduce the amount of labor for passive activities. But it needs to be stressed again, focus on quality not quantity, no pain and exertion activity is ineffective!