The oximeter is used to detect blood oxygen. The monitoring of blood oxygen by the oximeter belongs to non-invasive operation. It can effectively monitor the situation of blood oxygen in the body and plays a key role in predicting the changes of the disease. It mainly takes finger pulse oxygen as the monitoring index. If there is vascular atherosclerosis or vascular blockage, there is lipid deposition in the vascular cavity, and the peripheral blood circulation is not unobstructed, which is easy to lead to hypoxia. Using the oximeter to know the blood oxygen content also indirectly reflects the cardiovascular and cerebrovascular diseases. Improving the coronary angiography and cerebral angiography as soon as possible can understand the situation and formulate a reasonable treatment plan to prevent myocardial infarction and cerebral infarction. At the same time, it should be noted that the long-term clamping of finger pulse oxygen is easy to affect the blood circulation of finger tips due to local compression or cold weather, resulting in misjudgment. It can be re monitored after soaking in warm water to improve the accuracy of detection.