The paper summarized professor ZHANG Zuozhou′s experience in treating psoriasis from the pathogenesis of blood stasis and toxin. Professor ZHANG Zuozhou puts forward that "blood stasis and heat toxin accumulation" is the core pathogenesis of psoriasis

and the therapeutic methods are clearing heat

resolving toxins

invigorating blood circulation and dissolving stasis. Upholding the concept that "one recipe corresponds to one disease"

he deve-lops the self-made Jiedu Huoxue Decoction（解毒活血汤） as basic recipe

and modifies it based on syndromes. He advocates the flexible use of herbs and emphasizes the precaution on insect medicine. In his opinion

the healthy qi should be reinforced simultaneously when the pathogen is dispelled

and the spleen-stomach and yin-fluids should be cared always. He also advocates to reform the herbal preparation type for external application

and suggests using cream instead of traditional paste.