After effective treatment of patellar fracture, patients need to carry out early functional exercises to prevent knee stiffness, and the methods of functional exercises are different at different stages after treatment. Functional exercise after patella fracture needs to be carried out gradually according to the healing condition of the fracture and the time point. Within 2 weeks after fracture, the main activities are muscle contraction and passive flexion and extension of the toes to increase the strength of the quadriceps muscles, to avoid muscle atrophy and to avoid the formation of deep vein thrombosis in the lower limbs. In 4 to 6 weeks of fracture most of the patellar fracture scab formation, you can gradually carry out the knee joint passive and active flexion and extension activities. Flexion and extension can be gradually relaxed when there is a tugging sensation and pain, mainly to prevent stiffness and adhesion of the joint. In all processes the movements should be slow and no violence should be used. In the rehabilitation training after patella fracture. It should be reviewed in time, and rehabilitation should be carried out under the guidance of the specialist.