An ordered dental enamel-like structure of hydroxyapatite (HAp) was achieved through a solution mediated solid- conversion process with organic phosphate surfactant and gelatin as the mediating Transmission electron microscopy (TEM) tests demonstrated uniform sizes ill the obtained apatite nanorods which arranged in parallel to each other along the c-axis and Formed organized microarchitectural units over 10 mu m in size. The sizes of the synthetic hydroxyapatite nanorods were similar to that observed in enamel from human teeth. The formation and regulation of the orientation and size of HAp nanorods might lead to it better understanding of the biomineralization process for the preparation of high performance biomaterials.