Surgery should be the primary treatment for cruciate ligament cysts of the knee regardless of whether symptoms are present or not. If asymptomatic, excision of the cyst may reduce the chance of cruciate ligament rupture. 1. The treatments for cruciate ligament cysts include arthroscopic excision of the knee, ultrasound or CT-guided puncture and aspiration, and conservative treatment, but arthroscopic excision of the knee is the main treatment regardless of whether symptoms are present or not, and can achieve the goal of early cure. 2. Type I and most type II cysts can be completely resected through the conventional anterior approach to achieve the goal of radical treatment. If the cysts are large in size, ultrasound or CT-guided aspiration can be performed. 3. Type III and a few type II cysts can be resected through posterior approach. After complete resection of the cyst, early functional exercises can be performed to restore the function of knee joint. Knee cruciate ligament cyst is a relatively common disease in clinic, once it occurs, it should go to the hospital in time, and be diagnosed and treated under the guidance of professional doctors, so as not to be negligent and careless, so as not to delay the condition.