Abstract: Objective To investigate the correlation of the supine blood pressure with urine microalbumin in an elderly population. Methods From the employees of Kailuan group who participated the third physical examination,3064 retired employees with age of more than sixty years were randomly selected using the cluster sampling method.Among them,1692 met the inclusion criteria and were enrolled into the study. Rank correlation and partial correlation analysis were used to analyze the correlation of supine,standing and sitting systolic blood pressure（SBP）and diastolic blood pressure（DBP）with urine microalbumin. Multivariate Logistic regression analysis was used to analyze the influence of supine hypertension on urine microalbumin. Results The age of 1692participants（males:1122;females:570）was（67.3±6.2）years old,and urine microalbumin was（25.9±43.5）mg/L. The supine,standing and sitting SBP and DBP were correlated with urine microalbumin after adjusted for age and gender. Multiple Logistic regression analysis showed that after adjusted for age,gender and other factors,supine and sitting hypertension were risk factors for increased urine microalbumin（supine:OR=1.48,95% CI 1.14-1.92;sitting:OR=1.66,95% CI1.23-2.24,respectively）. However,orthostatic hypotension and orthostatic hypertension were not associated with urine microalbumin. When entered any of them in the analysis model,and adjusted for the same confounding factors,we found that only sitting hypertension was the most significant risk factor for increased urine microalbumin（OR=1.44,95% CI1.01-2.07）. Conclusion Sitting hypertension was the most significant risk factor of increased urine microalbumin in elderly population,and supine hypertension came second. Orthostatic hypotension and orthostatic hypertension were not associated with microalbumin.