The morphous and ultrastructural organization of Gymnocypris przewalskii spermatozoon was observed by scanning and transmission electron microscopes. The spermatozoon was consisted of the head, middle piece and the tail. The head of the spermatozoon was oval shape without acrosome, of which the main structure was nucleus, and only little cytoplasma was existed. At the caudal-lateral end of the head, implantation fossa trapped into the internal to the 1/3. The chromatin in nucleus was dense. The middle piece included centriolar complex and sleeve. The centriolar complex was inside the implantation fossa, which comprised proximal centriole (PC) and basal body (BD).The angle between PC and BD was obtuse. The sleeve, which contained several mitochondria, was connected to the posterior end of the nucleus. The tail of spermatozoon was slim and long. The main composition of the tail was axoneme, whose structure was the typical model of “9 2”. The tail had lateral fins, which was arranged symmetrically.