According to the textbook of diagnostics, the normal value of alpha-fetoprotein is 0-20ug/L, and if it is 14.9ug/L, it is not high. Due to the difference in reference value of hospitals in different regions, the specific local hospitals shall prevail. Alpha-fetoprotein is used to assist the diagnosis of primary liver cancer, but normal alpha-fetoprotein cannot exclude the diagnosis of liver cancer. The full name of alpha-fetoprotein is alpha-fetal globulin, which is mainly produced by fetal liver cells and yolk sac, and has important physiological effects on the fetus. In addition, the level of alpha-fetoprotein in pregnant women rises with the increase of pregnancy weeks, and is usually less than 400µg/L. If the level of alpha-fetoprotein in pregnant women is abnormally high, and is greater than 400µg/L, it is highly suspected that there is primary liver cancer or fetal abnormality, and the patient should go to the hospital for examination and treatment in a timely manner. If patients find that the value of alpha-fetoprotein is not within the normal range, it is recommended that they go to the hospital in time to consult a doctor and get a clear picture of the cause of the disease and then be treated under the guidance of the doctor.