Objective To analyze the phenomenon of morning blood pressure surge(MBPS) and relationship among it and body mass index(BMI), plasma glucose and blood fat through observing the changes of MBPS in elderly patients with primary hypertension. Methods The patients(n=256, male 112 and average=70.89±2.76, and female 144 and average=69.78±2.67) were chosen from Sept. 2012 to Sept. 2013. According to MBPS phenomenon of systolic blood pressure(SBP), the patients were divided into MBPS group(n=124) and non-MBPS group...