The first blood pressure 160mmHg the second blood pressure 120mmHg which is more accurate can not be determined, it is recommended that multiple measurements be averaged. Measurement of blood pressure if the difference in blood pressure is relatively large, it is recommended that the person being measured continue to rest, and after 5 to 10 minutes to measure again, while averaging multiple values, in order to be able to more truly reflect the level of blood pressure, can be more accurate reflection of blood pressure. Blood pressure is not a fixed value, and is affected by many factors, such as psychological factors, emotions, exercise, etc. The process of measuring blood pressure may also cause interference with blood pressure, so the preparation before measuring blood pressure is also very important. Before measuring blood pressure, you should pay attention to be quiet, avoid emotional excitement, exercise, smoking, drinking, etc., and make sure that the measurement method is correct to ensure accurate blood pressure values.