Since the outbreak of coronavirus disease 2019 (COVID-19)

the health authorities in various regions have formulated a group of traditional Chinese medicine (TCM) diagnosis and treatment programs based on the consensus analysis of etiology and pathogenesis of TCM experts

and recommended the guiding prescriptions for different syndromes in three stages of prevention

treatment and recovery. In order to effectively summarize the understanding of the pathogenesis of each scheme and the rules of the formulation of various prescriptions

based on 49 TCM prevention and treatment plans issued by the health administration departments

308 TCM prescriptions were sorted by stages (151 prescriptions in the treatment period

118 prescriptions in the prevention period and 39 prescriptions in the recovery period). The 2019-nCoV pneumonia prescriptions was further processed by using TCM inheritance platform system. The common syndromes and the frequency of commonly used Chinese medicines were summed up. The commonly used drug pairs and combinations in different stages were extracted

and their association rules were analyzed. The rules of the Chinese herbal prescription for COVID-19 were preliminarily summarized. During the treatment period

the main syndrome types are inner blocking causing collapse

epidemic toxin in the lung

cold dampness in the lung and toxic heat in the lung

involving 187 kinds of herbs

29 kinds of herbs with single taste frequency more than 20 times.Armeniacae Semen Amarum is the most frequently used

Gypsum Fibrosum-Armeniacae Semen Amarum is the most frequently used drug-pair

the core formula is Maxing Shigan Tang

and the main pathogenesis is cold

wet and heat. There is no unified syndrome type in the prevention period

involving 119 herbs in total. There are 13 kinds of herbs with single taste frequency more than 20 times. The most frequently used is Astragali Radix. The most frequently used medicine pair is Astragali Radix-Saposhnikoviae Radix. The core formula is Yupingfeng San

and the main pathogenesis is Qi deficiency. During the recovery period

the main syndromes are deficiency of lung and spleen Qi deficiency and Qi and Yin deficiency

involving 113 herbs

12 kinds of herbs with single taste frequency more than 10 times

Poria with the highest frequency of use

Citri Reticulatae Pericarpium-Poria with the highest frequency of drug pairing

Erchentang and Shengmaiyin with the main pathogenesis of deficiency of spleen Qi and Yin. The purpose of this study is to provide multiple references for strengthening clinical precise treatment

improving the effect of TCM treatment and promoting the management of TCM prevention and control resources.