This paper summarized professor Wang Yiqin’s characteristics of clinical experience in syndrome differentiation and treatment of asthma. Professor Wang claimed that the mixture of deficiency and excess was the pathogenesis of asthma， and the combination of phlegm and blood stasis was the long-standing root of asthma. The treatment principle of asthma was to give priority to the symptoms and give consideration to the fundamental treatment in the attack period， while give priority to the fundamental treatment and give consideration to the symptoms in the remission period. Professor Wang frequently used ancient classic prescriptions and adapted to clinical symptoms. She advocated that qi should be treated first during the attack of asthma， phlegm and blood stasis should be treated at the same time， and spleen and stomach should be protected from beginning to end. According to the clinical characteristics of phlegm dampness in most children as well as phlegm and blood stasis in most adults during the attack period， she proposed Xiaopingchuan formula and Dapingchuan formula added and subtracted from classic prescriptions to treat them separately， made good use of insect drugs and pair of drugs， and paid attention to children’s inspection， auscultation， and mild medication.