Abstract: Aim\ To investigate the characteristics of ABPM in patients of hypertension complicated with damages in end target organs.\ Methods\ Sixty eight hypertensive patients including 16 cases of left ventricular hypertrophy,12 cases of cerebrovascular attack,16 cases of ventricular hypertrophy complicated with cerebrovascular attack, and 24 cases of uncomplicated hypertension.\ All were studied with ambulatory blood pressure monitoring. \ Results\ The nondipper type of SBP and DBP at night time was the characterstic findings among the three complicated groups.\ The decrease rate of blood pressure was less than 10% in simple ventricular hypertrophy group, no SBP increase in day time. However, the increases of SBP in the morning is exclusive findings in the hypertensive patients with brain damaged. \ Conclusion\ Target organs damage in hypertensive patients usually accompanies with the changes of circadian changes of blood pressure.