Abstract: Objective: To explore the medication data in children with pharyngitis treated by Prof. Zhang Weidong, the chief physician, and to study the characteristics of his medication and the rules of prescription.
Methods: The clinical prescriptions of Prof. Zhang in the treatment of children with pharyngitis were collected. Excel and IBM SPSS 22.0 softwares were used to establish the database. A total of 700 prescriptions were analyzed by IBM SPSS Modeler 18 and Apriori algorithm of association rules, concerning the types and channel tropism of medicines, frequency in use, and the medication rules. The charts were used to describe them.
Results: The top five drugs, based on the frequency in use, were Baikal Skullcap, radix scrophulariae,scorched hawthorn fruit, licorice and Forsythia suspensa. The top three types of drugs with high frequency were heat-clearing drugs, the drugs for relieving cough and reducing sputum and the drugs for tonifying deficiency. The drugs were mainly cold, warm and mild in nature, and they were mostly sweet, bitter and pungent. The top three types of channel tropism of high-frequency drugs were in turn liver meridian, lung meridian and stomach meridian. According to association rules analysis, it was concluded that radix scrophulariae, Fritillariathunbergii, scorched hawthorn fruit, Baikal Skullcap, Forsythia suspensa, Licorice and dark plum were the core drugs.
Conclusion: Based on the analysis of the frequency in drug use, association and organs, it is shown that Prof. Zhang focuses on nourishing Yin, clearing heat, detoxification and resolving phlegm and blood stasis in the medication.

Key words: Pharyngitis, Qinghuayin, Medication law, Data mining, Children