1. Don't overeat the night before blood donation, and don't eat meat, fish, eggs, milk, bean products and greasy food for the first two meals. A light diet can prevent blood turbidity and affect blood quality. 2. Keep a good sleep the night before blood donation, and don't eat on an empty stomach before blood donation to avoid some reactions such as dizziness, palpitation and sweating during blood donation. If you have a cold, fever, cough, etc. Two days before blood donation, blood donation should be suspended. 4. Before preparing for blood donation, you can also read some blood donation publicity materials to lighten the ideological burden and reduce unnecessary reactions in blood donation.