采用简单的溶剂热法制备了ZnO纳米花状枝晶,枝晶主干长约400～500 nm,晶枝长约500～700 nm.利用XRD、SEM及EDS测试手段对ZnO纳米花进行物相、结构、形貌和成分表征的结果显示,ZnO纳米花为六方相纤锌矿结构,其中有少量钴的掺杂.所制备的ZnO纳米花对甲基橙溶液具有很好的光催化性能,在1.5 h光催化实验后,其降解率达到91.1%. ZnO nanocrystal dendrites were prepared by a simple solvothermal method. The main branch length of dendrite was about 400-500 nm and the length of crystal branch was about 500-700 nm. The morphology and structure of ZnO nanophase were characterized by XRD, SEM and EDS. , Morphology and composition of the results show that, ZnO nano flower hexagonal wurtzite structure, which contains a small amount of cobalt doped ZnO nanoscale prepared methyl orange solution has good photocatalytic properties, at 1.5 h photocatalytic experiment, the degradation rate of 91.1%.