Blood donation is a manifestation of moral nobility, it can alleviate the tension in our blood supply, it will increase one’s own hematopoietic function after donation, and comparatively speaking, no evidence of harmful effects on the human body has been found in reasonable blood donation. Blood donation is the collection of blood through a special organization, on a voluntary basis, for use by clinical patients in case of need. Blood donation is a sign of moral nobility and can help patients in need. In addition, to a certain extent, it can alleviate the tension of blood supply in our country. After donating blood, human beings are conducive to the metabolism of blood in their own bone marrow, thus promoting the regeneration of hematopoietic cells. The disadvantage is that blood donation requires venous puncture in the vein, which will cause a certain degree of pain. In addition, the blood loss caused by blood donation will have a little impact on the work of life in a relatively short period of time, but basically can be recovered in a week or so. In addition, some people may have reactions to blood donation, especially if they donate blood frequently for a short period of time, which may cause symptoms such as pallor, dizziness, chest tightness, nausea, vomiting and palpitations. It is recommended to donate blood according to one’s ability, and there is no need to force oneself to do so. Patients are advised to exercise actively in their daily life and have a reasonable diet.