To donate blood, it is necessary to fulfill the conditions of good health, normal laboratory indicators and suitable age. 1. Physical health: plasma donors should meet the standards of physical health, be free of infectious diseases, and meet the basic indicators of blood pressure, blood sugar, body weight, vital signs, and so on. 2. Normal laboratory indicators: blood donors should meet the physical examination indicators of the hospital, such as normal blood tests, normal liver function, negative hepatitis C antibody, negative HIV antibody, etc. 3. Appropriate age: blood donors should not be too young or too old, but should be adults between 18 and 55 years old. 4. Other conditions: no medication, alcohol consumption, etc. before blood donation, regular work and rest. Women should not be in the menstrual period, and there should be a gap of more than 6 months between the time of blood donation and the last time of blood donation, and their weight should be in line with the requirements. Don’t eat too much or drink a lot of water before donating blood, and get enough sleep.