Objective:To study on the law of application of drugs in complex prescriptions of Chinese herbs for treatment of hypertension. Methods:The author read 1 102 papers about treatment of hypertension from 1980 to 2003

collected 1 191 complex prescriptions of Chinese herhs

established Access database of complex prescription of Chinese drugs for treatment of hypertension

and analyzed the law of application of drugs in complex prescription of Chinese herbs for treatment of hypertension by combination of Access

Excel with VB programming based on the database.Results:In the 1 191 complex prescriptions of Chinese herbs

394 herbs were used 11 371 times.Among them

the drugs for reinforcing deficiency

clearing heat

calming the liver to stop the wind

and activating blood stasis and removing blood stasis are main.192 pairs of drugs were used over 50 times

with 21 traditional drug pairs of Chinese medicine

and combination principles of the first 10 pairs with the highest application frequency were analyzed by TCM combination theory.And there were 30 drug groups which were used for over 50 times

and prescription composition principles of the first 10 groups with the highest application times were analyzed by TCM composition theory.Conclusion:Large- scale data process with computer is an effective method for finding the law of application of drugs in Chinese complex prescriptions for treatment of hypertension.