Modern medical research has proved that obstructive sleep apnea-hypopnea syndrome(OSAHS)has a close relationship with stroke，but there are fewspecific papers which discuss the common etiology and pathogenesis between them.By referring to ancientmedical treatises of Chinese medicine and summarizing the studies of many scholars in recent years， the authors expounded the thoughts that the common etiology of OSAHS and stroke is obesity， and the core pathogenesis is internalgeneration of phlegmand dampness and mutualaccumulation of phlegmand stasis.The authors also pointed out that the treatment for the disease is invigorating the spleen，resolving the phlegmand removing stasis.