High blood pressure in the morning and evening and normal in the daytime are usually seen in hypertensive patients and the elderly, usually due to abnormal blood pressure regulation. When blood pressure regulation is normal, the daily rhythm of diurnal fluctuations is characterized by the phenomenon of “double peaks and double valleys”, i.e., blood pressure reaches its lowest value at 2-3 a.m., with peaks at 6-10 a.m. and 4-8 p.m., and then a slow decline at 8 p.m. This phenomenon is more pronounced in patients with hypertension and in the elderly. This phenomenon is more pronounced in hypertensive patients and the elderly. The diurnal fluctuation of blood pressure daily rhythm has an important significance for the selection of the time to measure blood pressure, but also for patients with hypertension to determine the medication program, there is a certain significance of guidance. Patients whose blood pressure is high in the morning and evening and normal in the daytime are advised to go to the hospital in time to improve the relevant examinations and actively receive regular treatment, so as not to delay the best time for treatment.