Low hemoglobin value after kidney transplantation needs to be judged by clinical history and symptoms, and the main reasons include excessive blood loss, malnutrition and abnormal renal function. 1. Excessive blood loss: obvious bleeding during the operation will lead to a large loss of red blood cells and hemoglobin in the body and cause related symptoms. 2. Malnutrition: During the recovery period, the body is weak and the nutrient absorption is deviated, resulting in the decrease of hemoglobin synthesis, which will also cause related symptoms. 3. Abnormal renal function: abnormal renal function and increased renal permeability will lead to renal blood loss and cause related symptoms. Low hemoglobin quality after kidney transplantation, which has not been recovered, requires timely medical observation to confirm the diagnosis of the condition, and then standardized treatment under the guidance of clinicians.