The mechanism of bone cyst formation is not clear, and bone cysts, as benign bone tumors, have a small impact on the human body. Bone cysts can be observed, as long as they do not cause excessive impact on the strength of the bone cortex, then regular X-rays can be taken to observe the size changes. 1. It may be due to genetic mutation, i.e., in the process of congenital development, there is a hollow bone, the cavity gradually accumulates liquid, forming a bone cyst. 2. There may be the influence of environmental factors and other acquired factors, that is, it may be due to acquired bone injury, inflammation and other lesions leading to bone ablation, exudate accumulation, and gradually wrapped to form bone cysts. It is a limited lesion, usually does not invade the surrounding tissues and does not have distant metastasis. Without special symptoms, it can be treated without any special treatment and continue to be observed. In addition, appropriate supplementation of calcium and vitamin D is also conducive to the treatment of cysts. If the cyst is large, scraping surgery can be performed to completely eliminate the tumor, but if the bone tumor is not completely scraped, it is more likely to recur, so it is important to pay attention to the way and method of treatment.