In recent years, hip arthroplasty has become the most common and mature type of surgery for the treatment of femoral head necrosis, elderly femoral neck fracture and hip osteoarthritis, and its good efficacy has been confirmed by long-term follow-up of a large number of cases. It is the common expectation of orthopedic surgeons and patients to achieve good surgical results with minimal incision and surgical trauma while ensuring the success of hip arthroplasty. Minimally invasive hip arthroplasty features a small incision of 6-8 cm for artificial hip replacement, which is more delicate than the traditional incision of 12-18 cm. It includes surgical techniques such as avoiding excessive soft tissue damage, preserving muscle attachment points, and precisely fitting hip prosthesis, which allows patients to avoid unnecessary surgical invasion of the hip structure and preserve various functional structures as much as possible. Compared with traditional surgery, minimally invasive surgery has the following advantages: the surgical incision is small and the muscles are not cut off, which greatly reduces the amount of bleeding and the time to reveal the surgical field; the postoperative recovery is quick, and patients can get out of bed and walk as soon as possible, which reduces the incidence of early postoperative complications such as decubitus ulcers, pneumonia and urinary tract infections, reduces the length of hospitalization and costs, improves the quality of life and reduces the burden of family care; as the muscles around the hip joint are protected as much as possible, the hip joint is not damaged. The muscles around the hip joint are protected as much as possible to avoid the risk of damaging important nerves, and the joint function can be recovered as early as possible, and dislocation of the prosthesis rarely occurs; because there is little intraoperative bleeding and no postoperative drainage is placed, risks such as infection, severe swelling of the limb and deep vein embolism rarely occur. Minimally invasive artificial hip arthroplasty includes artificial femoral head replacement and artificial total hip replacement. The indications are patients with femoral head necrosis, osteoarthritis of the hip joint, elderly femoral neck fracture and some patients with severe intertrochanteric fracture combined with osteoporosis. Individualized treatment and post-operative rehabilitation plan will be made according to the patient’s specific condition.