ObjectiveTo investigate the rule and characteristics of herbs used by Professor YAN Zheng-hua to treat digestive common diseases.Methods253 prescriptions of treating digestive diseases were searched.Medications for stomach ache,epigastric fullness,abdominal pain,diarrhea,constipation were analyzed by data mining and statistic method.ResultsThe common medications for stomach ache include Dried tangerine peel,Cyperus rotundus,White peony root and the most commonly used two-drug compatibility is “Dried tangerine peel and white peony root” (65.85％) ; common medications for epigastric fullness include Dried tangerine peel,Amomum villosum,Cyperus rotundus and the most commonly used two-drug compatibility is “Dried tangerine peel and Amomum villosum” (64.02％) ; common medications for abdominalpain include Tuckahoe,Dried tangerine peel,Red peony root and the most commonly used two-drug compatibility is “Tuckahoe and Dried tangerine peel” (50％) ; common medications for diarrhea include Tuckahoe,fried Malt,fried Grain buds and the most commonly used two-drug compatibility is “Tuckahoe and Atractylodes macrocephala” (67.5％) ; common medications for constipation include Radix Polygoni multiflori,Chinses Angelica,Semen Cassiae and the most commonly used two-drug compatibility is “Atractylodes macrocephala and Chinses Angelica” (56.52％) and “Hemp seed and Chinses Angelica” (56.52％).Conclusion Professor YYAN Zheng-hua believed that soothing the liver and regulating Qi,and regulating spleen and stomach is the basic therapeutic principle for digestive diseases.