The rational design and controllable synthesis of Cu2 O microstructures using PEG-2000 as a capping agent have been reported in this manuscript. By adjusting the amount of PEG-2000,nest-like Cu2 O microstructures assembled by irregularly nanorods and sphere-like Cu2 O microstructures could be obtained. The phase composition,morphology and optical peroperties of as-prepared samples were investigated by X-ray diffraction( XRD),scanning electron microscope( SEM),transmission electron microscope( TEM)and UV-Vis diffuse reflectance spectra( UV-Vis ). The XRD patterns indicated the as-obtained microstructures were pure phase cubic Cu2 O. SEM and TEM images exhibited the morphologies of Cu2 O could be adjusted by PEG-2000. Based on the physical and chemical properties of Cu2 O and the morphologies results,the possible mechanism for the formation of Cu2 O microstructures with different morphologies has been proposed. UV-Vis spectra showed all of the Cu2 O microstructures with different morphologies could absorb visible-light. By investigating the photocatalytic activities of all Cu2 O photocatalysts,RhB aqueous solution has been used as the photocatalytic degradation target pollution. As a result,the nest-like Cu2 O microstructures and sphere-like Cu2 O microstructures showed enhanced photocatalytic activities than the flower-like Cu2 O microstructures.%通过合理的设计与调控，利用聚乙二醇-2000（ PEG-2000）作为结构导向剂，成功制备了微米结构的氧化亚铜（ Cu2 O）.通过调节 PEG-2000的量，产物形貌可分别展现为由不规则纳米棒组成的鸟巢状 Cu2 O和Cu2 O微米球.产物相组成、形貌及光学吸收性能由X射线衍射（ XRD）、扫描电子显微镜（ SEM）、透射电子显微镜（TEM）和紫外-可见漫反射光谱（UV-Vis）表征. XRD 谱表明，所有制备的微米结构均为纯净立方相Cu2 O. SEM和TEM结果证明，PEG-2000的加入可以有效调控Cu2 O材料的微观结构.基于Cu2 O的物理、化学性质及产物形貌等，提出不同形貌Cu2 O微米结构的形成机理. UV-Vis谱表明不同形貌产物均具有可见光吸收.利用可见光照射下罗丹明B的降解实验考察了不同形貌Cu2 O微米结构的光催化性能.结果证明，与未加PEG-2000制备的Cu2 O材料相对比，鸟巢状Cu2 O和Cu2 O微米球显示出更高的光催化降解有机染料活性.
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