Hyperextended knee is one of the common complications in hemiplegia patients after stroke due to muscle weakness or spasm of lower limbs and proprioceptive disorder. So far, its specific pathogenesis is not clear. Patients may have limited functional activities and pathological changes due to over extension of the knee joint, and those who have serious illness may have limited walking, which will affect their ability of daily life and quality of life. Rehabilitation training can help reduce the occurrence of hyperextended knee after stroke and improve the walking function of patients. This paper reviews the progress in rehabilitation and prevention of hyperextended knee in patients after stroke, in order to provide references for clinical prevention and treatment of hyperextended knee.