Abstract: ZnO is one of important semiconductor materials and widely used in photoelectronic fields.With the development of nanoscience,more and more researches about ZnO as nano materials have been reported.From the point of electrostatic energy and elastic deformation energy,the author analyzes the growth mechanism of the single-crystal nanorings from belts into rings via a self-coiling process.Therefore,the physical mechanism and the circumstances of the formation of the nanobelts have been illustrated.