γγ5-Aminolevulinic (ALA) photodynamic therapy (PDT), referred to as ALA-PDT, is a technique that combines photosensitizers and corresponding light sources to selectively destroy lesions through a photodynamic response. Photodynamic therapy (PDT), referred to as ALA-PDT, is a technology that selectively destroys lesions through photodynamic reactions by combining photosensitizers and corresponding light sources.γγThe main technical features are: 1, good selectivity, photosensitizer (Ira) and the abnormal growth of the organization is highly combined with warts, receive a specific wavelength of laser local irradiation, laser energy selective destruction of the lesion tissue, and the normal tissue around the lesion damage is minimal; 2, less traumatic, because of the high selectivity of PDT, can avoid and significantly reduce the trauma and pain caused by other physical therapy, and no ulcers and scar formation. 3, can eliminate hidden lesions (subclinical infection), reduce the recurrence rate; 4, repeatable treatment, lesion cells will not be resistant to photosensitive drugs.