Objective To explore the medication pattern of Chinese medicine practitioner LYU Guoxiong in treating vertigo from the phlegm theory,and to provide diagnostic and therapeutic solutions and scientific basis for the treatment of vertigo by traditional Chinese medicine.Methods To collect the diagnosis and treatment information of patients who attended the outpatient clinic of the Department of Neurology,Affiliated Hospital of Jiangxi University of Chinese Medicine and diagnosed with vertigo from October 2023 to March 2024,to construct a database of the inclusion criteria,and to analyse the frequency of use of traditional Chinese medicines,the four Qi,the flavour of a drug,the attribution of the meridians,the rules of association,and the clustering.Results A total of 150 patients with vertigo who met the criteria were included,and 150 prescriptions were recorded.Involving 114 flavours of traditional Chinese medicine,the total frequency of traditional Chinese medicines using was 1846 times.Among them,16 Chinese medicines were used>30 times,in the order of Huanglian,Fuling,Gancao,Baizhu,Chenpi,Banxia,Zhuru,Yanhusuo,Xiangfu,Niuxi,Gouteng,Zhenzhumu,Huangqin,Chaihu,Shouwuteng etc.The efficacy of high-frequency drugs was based on clearing heat and drying dampness to resolve phlegm,inducing dampness to strengthen the spleen,lowering Qi to resolve phlegm and remove lumps,relieving Qi stagnancy in stomach,activating blood circulation and removing blood stasis,etc.The tastes of the drugs were mostly to be hard and warm,sweet and flat,and bitter and cold,and the attributing meridians were mainly the spleen and liver meridians.The most commonly used drug pairs were Fuling-Zhuru,Huanglian-Fabanxia,Chenpi-Zhuru,Fuling-Gancao,etc.The drug pairs with high association support and confidence level were Huanglian-Chenpi,Fabanxia-Chenpi,Zhishi-Zhuru,Zhuru-Fabanxia,Fuling-Chenpi,Gancao-Chenpi.Conclusion Treating dizziness from the perspective of phlegm,the method of treating dizziness is to clear heat and phlegm,clear the gallbladder and stomach.Commonly used formulas such as Huanglian Wendan decoction are modified and adjusted according to the syndrome.