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In order to investigate the spermiogenesis of the Korean Native Jin-do dog, the tissue sampled from the testis and the epididymis of matured dog were conventionally prepared as thin sections. And then these sections were observed under a transmission electron microscope. Based on the development of various permanent organelle and certain transient structures, the spermiogenesis of the dog could be divided into four major phases: Golgi, cap, acrosome and maturation; and these phases had been futher subdivided into seven stages. In the maturatin phase, the karyoplasm has been condensed completely and the nucleus eleongated as the movement of the unclear ring. The equatorial segment has notable waist-form at the late acrosomal stage. In the cross section of the tail, it shows a typicl 9＋9＋2 pattern of the axial fiber bundle condisting of the dense fibers, the inner fibers, and a central pair. The dense fiber number 1, 5, 6, and 9 were larger in diameter than the rest of the dense fibers.
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