Inclusion Criteria:  Between 18 years old (including 18 years old) and 45 years old; Patients who underwent simple ACL reconstruction for the first time, combined with cartilage trimming and partial meniscus resection, and had the same postoperative rehabilitation plan; Those who have basic literacy and communication skills; Those who have a smartphone, can use WeChat or can learn to use WeChat;  Exclusion Criteria:  Have a history of joint infection, joint tuberculosis or osteomyelitis, or have undergone surgery in the lower limbs within 6 months; Combined with severe heart, brain, kidney, and other organ dysfunction; Patients with other severe knee joint disease injuries; The patient is accompanied by mental illness or cognitive impairment, unable to study and participate in rehabilitation training; Those who have participated in other similar rehabilitation function training programs, or transferred to other medical institutions for rehabilitation after being discharged from the hospital; Those who have not signed the informed consent.