Unpopular medicinals refer to those not commonly used in the clinical practice in traditional Chinese medicine （TCM）. This paper summarized the clinical experience of professor WANG Canhui in treating lung diseases with unpopular medicinals. There are 14 unpopular medicinals of high frequency， and they can be categorized into five types according to the function， which are lung-diffusing and exterior-releasing medicinals including Lanxiangcao （

Caryopteris incana

） and Jinfeicao （

Herba Inulae

）， lung-rectifying and phlegm-dissolving medicinals including Zaojia （

Fructus Gleditsiae

）， Zhuyazao （

Fructus Gleditsiae Abnormalis

）， and Fuhaishi （

Pumice

）， cough-relieving and panting-calming medicinals including Liuzhouzi （

Chinese Azalea Fruit

）， Pishuang （

Arsenolite

）， and Zhongrushi （

Stalactitum

）， lung-clearing and fire-draining medicinals including Zhongjiefeng （

Herba Sarcandrae

）， Lujian （

Salt Alkali

） and Houzao （

Calculus Macacae Mulattae

）， and deficiency-supplementing and lung-nourishing medicinals including Haizhe （

Jellyfish umbrella

）， Canyong （

Silkworm Faeces

） and Yubiao （

Air bladder of Large yellow croaker

）. The cha-racteristics of clinical practice of each herb， the combination of medicinals， and precautions are summarized as well.