Abstract： LIN Xiaquan holds that the main pathogenesis of fever from external contraction in the Lingnan area is the spleen deficiency and exuberant dampness，and external contraction and wind- heat； such disease can be divided into mild and severe external contraction and wind- heat and may bring out transmuted and combined syndromes of dampness- heat pouring downward to the stomach- intestines， bladder， and so on. The treatment should focus on clearing heat and draining dampness， and venting pathogen and bringing down a fever. Self- made Qingling tang is a proven prescription and is made into Qingchailing oral liquid， which is a hospital preparation produced by Guangdong Hospital of Traditional Chinese Medicine；the clinical application has been achieving satisfying effects.