Abstract：Stroke is mostly caused by the mutual interaction of wind，fire，phlegm，qi，deficiency and stasis， which leads to the derangement of qi and blood， harassing the brain. However， medical practitioners in the past dynasties have different perspectives on the treatment of stroke，and there are various treatment methods. Starting from the key pathogenic factors helps to achieve more ideal curative effect on stroke，and phlegm-damp is closely related to stroke in fact. Based on the theory of “the spleen being the source of phlegm production，and the lung being the receptacle that holds phlegm” and after reading ancient books and literature research of Chinese medicine，the authors found that phlegm-damp is not only highly correlated with risk factors of stroke，but also the key pathogenic factor and pathological product of stroke，and that the mutual interaction and transformation of phlegm-damp with qi deficiency and blood stasis run through each stage of stroke with corresponding clinical symptoms. Therefore，in the treatment of stroke，attention should be paid to phlegm-damp，and the regulation and tonification of the spleen and lung. Specifically，it can be treated by stages according to the development of stroke. In the acute stage，it should resolve phlegm and unblock the bowels to remove pathogen and excess；in the recovery stage，it should bank up earth to generate metal to tonify the spleen and lung.