咳嗽是儿童时期常见症状，其中慢性咳嗽因病因多样、缠绵难愈，常需反复就诊，给患儿及家长带来较大的生活及经济困扰。程燕教授以中西医结合辨治慢性咳嗽为专长，倡导西医辨咳嗽病因，中医辨咳嗽证候，两者结合提高慢性咳嗽的临床疗效，并结合多年临床经验，自拟百咳汤，随证加减治疗儿童慢性咳嗽，效验颇丰。在病证结合、辨证施治的基础上，程燕教授重视"整体观"，强调在慢性咳嗽恢复期，重视肺脾功能尤其是脾胃功能的调整，增强正气以防止咳嗽的复发。

Cough is a common symptom in children, and the chronic cough often needs repeated medical treatment since causes are diverse and difficult to be cured, which brings great life and economic troubles to children and their parents.Professor Cheng Yan specializes in the therapy of chronic cough by combination of traditional Chinese and Western medicine. Advocating that Western medicine to distinguish the causes of cough and traditional Chinese medicine to distinguish the symptoms of cough, and uses the combination to improve the clinical efficacy of children′s chronic cough. She formulated Baike decoction with her years of clinical experience to treat children′s chronic cough according to the symptoms, which has remarkable curative effects. Based on the combination of disease and syndrome, syndrome differentiation and treatment, Professor Cheng Yan attaches importance to the" holistic view" , emphasizing that attention should be paid to the adjustment of lung and spleen function, especially the function of spleen and stomach during the recovery period of chronic cough, so as to strengthen healthy qi and prevent the recurrence of cough.