Clinical patients with low blood oxygen index after surgery, the common reasons are mainly the following: First, due to the low temperature of the operating room, which will cause the skin temperature of the patient’s hand to drop significantly, the oxygen saturation measured through the fingers after surgery, the index of oxygen saturation will also drop. It is recommended that the patient hot towel wet compresses the finger joints, the temperature at the fingers back to normal and then monitor the oxygen saturation again, can be measured as a normal value. Second, the patient needs tracheal intubation during the operation, resulting in more sputum stagnation in the trachea, which affects the exchange of oxygen and carbon dioxide after the operation, and there will be a decrease in oxygen saturation index. The patient is given nebulized dilution, so that the sputum in the trachea is discharged faster, and at the same time, the patient is given mask oxygen inhalation to inhale more oxygen, which can effectively improve the situation of reduced oxygen saturation.