The following preparations should be made before donating blood: Firstly, you should learn about blood donation and eliminate psychological fears. Secondly, do not fast before donating blood, as this may cause dizziness. Thirdly do not take drugs that may affect the quality of blood. Fourthly, don’t stay up late and don’t overeat or eat too much greasy food in the near future, which can cause problems such as lipidemia. This is very good for protecting the quality of blood and of course for one’s physical and mental health. After donating blood, we can also supplement some milk. After donating blood, do not do strenuous exercise, do not stand up at once, which can cause dizziness and other phenomena, which is still very good for our personal body and mind, and is also a kind of protection.