Unreasonable matching of single hospitalization items and means of use: From the overall medical process, unreasonable medical behavior should include unreasonable treatment and unreasonable medication besides unreasonable examination. At the same time, due to the particularity of medical behavior, in some cases, it is necessary to judge the irrationality of medical service from the perspectives of medical ethics, medical ethics and medical style. In addition, medical insurance is also an important aspect of defining unreasonable medical behavior. On the one hand, under the current level of social and economic development, China can't provide medical services on demand for the time being. Therefore, medical insurance needs to adjust and allocate medical resources from a macro perspective, and supervise and manage medical service behavior. On the other hand, the medical insurance policy is closely related to the price of medical services, the code of conduct and income of medical institutions and medical personnel.