Stroke is known as cerebral stroke, the hemiplegic knee extension caused by stroke can be recovered by using passive movement of the affected limbs as well as active activities in bed. 1. Passive activities of the affected limbs: take the supine position, with the help of the rehabilitator or family members, carry out passive flexion, extension and rotation of the ankle, toes, hip and knee joints, as well as muscle massaging and pulling, in order to correct the posture. Be careful not to cause obvious pain during the exercise, and do not force the movement when encountering joint adhesion. 2. Active activities in bed: completed by the patient on his own initiative, but if the patient’s degree of recovery has not been reached, it can be completed by family members to assist. (1) Lift the leg straight forward: the patient should take the supine position, keep the knee as straight as possible, lift the affected limb upward, and then put it down slowly, which can be repeated several times. (2) Lifting the leg straight backward: the patient lies in the prone position, keeps the knee as straight as possible, lifts the affected limb upward, and then puts it down slowly, which can be repeated several times. (3) Lifting the leg inwardly: the patient takes the supine position, keeps the knee as straight as possible, lifts the affected limb inwardly, and then puts it down slowly, which can be repeated several times. In addition, through massage, physical therapy and other ways can also play a role in assisting the recovery. It is recommended that patients choose the appropriate way to recover under the guidance of the doctor.