Anterior cruciate ligament t2wi high signal is one of the most common descriptive terms used in MRI, and is diagnosed in conjunction with t1wi, which may indicate anterior cruciate ligament degeneration or injury. Normally, the ACL is relatively homogeneous and low signal, with occasional linear high signal at the superior or inferior intersection, which is a normal signal change. In ACL injury, there is localized congestion and edema, which can be seen by MRI. When the ACL is injured, it shows low signal in t1wi and high signal in T2wi; if the high signal in t2wi is accompanied by low signal in t1wi, it suggests that the ACL is injured. It also needs to be combined with physical examination and clinical manifestations. If the t2wi high signal of the ACL is detected, it is recommended to go to the hospital for consultation, and be diagnosed and treated in time by a professional physician.