Anesthesia is divided into general anesthesia and site anesthesia (i.e., semi-anesthesia) based on the effect on the whole body. General anesthesia refers to the use of intravenous or inhaled general anesthetics is a form of anesthesia in which the patient loses consciousness, general pain is absent, and memory is temporarily and reversibly lost. It is often necessary to assist with tracheal intubation ventilator-assisted ventilation and other operations. It is generally safe and comfortable. It can be applied to the vast majority of surgeries. Departmental anesthesia includes intrathecal, nerve block, and local anesthesia. The most commonly used form of intrathecal anesthesia is also commonly referred to as “hemi-anesthesia. The “hemi-anesthesia” requires a puncture in the spinal space of the patient’s back, which is usually painless and not too uncomfortable if the patient is able to cooperate with the puncture position and with the aid of local anesthesia. However, the patient may remain awake during semi-anesthesia, and the operation of the surgeon and the mechanical sounds in the operating room often make the patient feel fearful and uncomfortable. The anesthesiologist can make the patient sleep quietly with the aid of sedation according to the patient’s condition and surgical needs, so most patients can also feel safe and comfortable. “Half anesthesia” is used for most lower extremity and lower abdominal surgeries. However, there are some cases where “semi-anesthesia” cannot be used, such as: when the patient has abnormal coagulation function; when the patient cannot cooperate with the position, etc.