Abstract: Objective To investigate the accuracy of OMRON upper-arm electronic blood pressure（BP）monitor HEM-1000by comparing its indirect BP measurement with the direct BP measurement in the brachial artery.Methods Among the 200patients enrolled in this study for coronary angiography,110were males and 90females.Blood pressure levels were recorded with both OMRON upper-arm electronic monitor HEM-1000and the direct measurement in the brachial artery. Bland-Altman plots were constructed for their comparisons and the accuracy of the upper-arm electronic monitor evaluated by the British Hypertension Society（BHS）standard. Results There was a close correlation between the indirect arm and direct brachial BP readings. No statistically significant difference was observed in both systolic（132.7±22.2）vs（132.4±21.7）mm Hg,P=0.153and diastolic（81.7±13.5）vs（81.2±13.8）mm Hg,P=0.104levels between the indirect arm readings and direct brachial readings.As reflected in Bland-Altman method,there was good consistency between the two readings. According to the BHS standard,OMRON arm electronic blood pressure monitor HEM-1000was categorized as Grade A for systolic and diastolic BP levels. Conclusion OMRON upper-arm electronic BP monitor HEM-1000can reflect BP values accurately.