Inability to measure blood pressure should be adjusted to find out the reasons, generally due to the sphygmomanometer itself, the measurement of blood pressure is not standardized, the patient’s side of the factors and so on. 1. Problems with the sphygmomanometer itself: Since the quality of the sphygmomanometer is problematic or it is not calibrated in time, the deviation is relatively large, and it is recommended that the patient should replace the sphygmomanometer or carry out the debugging. 2. The measurement of blood pressure is not standardized: the patient should rest quietly for 5~10 minutes before the measurement; when measuring blood pressure, the cuff is loose or tight; the position of the sphygmomanometer is not at the same level as the heart, which may lead to inaccuracy of the measured blood pressure. 3. Patient factors: For example, in simple clinic hypertension, patients who are emotionally excited and drink a lot of alcohol before measuring blood pressure may have measurement errors. Before measurement, the patient should maintain a stable average and avoid drinking alcohol or engaging in heavy exercise activities. If obvious fluctuation of blood pressure occurs, it is recommended to go to the hospital in time for early and regular treatment.