After hematopoietic stem cell transplantation, both recipient and donor diets need to be light, nutritious, easy to digest, high-calorie, rich in vitamins, etc. Soy sauce is not a contraindication; recipients need to be sterilized for consumption of soy sauce, while donors do not have the requirement of sterilization, which is mainly dependent on individual habits, etc. 1. Hematopoietic stem cell transplantation refers to the infusion of normal donor or autologous hematopoietic stem cells into the patient through blood vessels, so as to rebuild normal hematopoietic and immune functions. 2. Post-transplant diet (1) Recipient: need to be disinfected and sterilized, should pay attention to light, nutritious, easy to digest, give high-calorie, vitamin-rich food after appetite improves, limit spicy, stimulating, hard food, drink more water, do not use toothpicks to pick teeth, avoid eating too hard, thorny food, and keep defecation unobstructed. (2) Donor: After transplantation, you should increase the intake of fresh vegetables and fruits, which contain a lot of fiber and vitamins, are light, less oily and easy to digest, and prohibit cold, spicy and stimulating foods. Soy sauce is not a dietary contraindication after hematopoietic stem cell transplantation, but it should be considered from various aspects such as one’s own dietary habits, and moderation is appropriate.