Precautions after hematopoietic stem cell transplantation include regular follow-up, prevention of infection, and appropriate exercise. 1. Regular follow-up. It is best for patients to have weekly checkups in the first month after transplantation, monthly checkups thereafter, and tri-monthly checkups after three months. The main purpose of the follow-up is to observe the rejection after transplantation. 2. Prevent infection. To reduce the risk of infection, patients should go to less crowded places, wash hands frequently, ventilate more, eat fully cooked food, and avoid contact with patients with infectious diseases. 3. Appropriate exercise. Encourage patients to exercise appropriately, which helps the recovery of body functions. Specific precautions need to consult the attending physician and follow the doctor’s instructions.