According to the latest Chinese guidelines, blood pressure is divided into normotension, normal high value and hypertension, and hypertension is divided into grade 1 hypertension, grade 2 hypertension and grade 3 hypertension. Normal blood pressure refers to systolic blood pressure <120mmHg and diastolic blood pressure <80mmHg, while normal high value refers to systolic blood pressure 120-139mmHg and diastolic blood pressure 80-89mmHg. If systolic blood pressure >140mmHg and diastolic blood pressure >90mmHg is hypertension. So the normal range of systolic blood pressure is strictly speaking 120mmHg, and the normal range of diastolic blood pressure is at 80mmHg.