This article introduced the experience of national TCM master Tan Xinhua in the treatment of psoriasis.Professor Tan believes that the imporant pathogenesis of psoriasis is the accumulation of latent toxin, the combination of latent toxin and blood stasis, the damage of vital energy, the deficiency of vital energy, the inability to dispel latent toxin and potential latent toxin.Under the guidance of the thought of “preventive treatment of diseases”, he advocates that the treatment of psoriasis should start from three aspects: prevent before d...