Abstract： This article introduces Professor PENG Kang's clinical experience in treating insomnia. Professor PENG Kang believes that there are various causes of insomnia，with the main pathogenesis being the exuberance of yang with the decline of yin，as well as the failure of yin-yang interaction. The general principle of treatment is to treat deficiency by supplementing and to treat excess with drainage，as well as harmonizing yin and yang. Clinically， it emphasizes the treatment based on syndrome differentiation； the good use of Chinese medicinals for calming the mind is often combined with the use of Chinese patent medicine； the importance is attached to the application of qi and blood theory in the diagnosis and treatment of insomnia， and the attention is paid to mental regulation and sleep hygiene. By overall conditioning and treating both the symptoms and root causes，good results can be achieved.