In this paper, recent progresses in model studies of cyclobutane pyrimidine dimer photolyases and (6-4) photoproduct photolyases have been reviewed. 评述了环丁烷型嘧啶二聚体光解酶和(6-4)光产物光解酶的模型研究进展，并展望了该领域的发展前景。
UV radiation induced two major classes of pyrimidine dimmers:the pyrimidine (6-4) pyrimidone photoproduct (6-4 product) and the cyclobutane pyrimidine dimmer(CPD). 紫外光照射可导致生物体产生两种损伤：(6-4)光产物和环丁烷嘧啶二聚体。
