Objective:To explore the clinical values ofdifferent ambulatory blood pressure monitoring(ABPM)parameters to hypertensive target organs damage. Methods:100 primary hypertensive patients were picked out to perform ABPM

and divided into isolated hypertension group (hypertension group)and hypertensive organs damaged group(organs damaged group)accordingtothe condition with or without target organs damage. The ABPM parameters between the two groups and among the organs damaged group were valuated with statistic methods. Results:(1)nighttime average systolic blood pressure

nighttime average pulse pressure

daytime and nighttime systolic blood pressure load in target organs damaged group were higher than those in hypertension group (P<0.05).(2)The ratio of abnormal day-night rhythm

24 h average systolic blood pressure

nighttime average systolic blood pressure

daytime and nighttime systolic blood pressure load were higher in the patients with 3 target organs damage than those in ones with 1 target organ damage (P<0.05). 24 h average diastolic blood pressure

daytime and nighttime average diastolic blood pressure

nighttime systolic and diastolic blood pressure load were higher in the patients with 3 target organs damage than those in ones with 2 target organs damage (P<0.05).24 h and daytime average diastolic blood pressure were lower in the patients with 2 target organs damage than those in ones with 1 target organ damage(P<0.05)

but 24 h average pulse pressure was higher in the patients with 2 target organs damage than those in ones with 1 target organ damage(P<0.05). Conclusion:ABPM parameters about systolic blood pressure are the most valuable ones in clinical judging hypertensive target organs damage and their extent.