To achieve vascular casts of testicular and ovarian arteries and investigate their morphological characteristics in lamb and adult plateau-type Tibetan sheep (Ovis aries), ten testes from five adult rams and ten ovaries from five adult ewes as well as three-month-old lambs were collected, and their arterial corrosion casts were obtained by 8%﹣10% ABS perfusion, and then their anatomical characteristics were determined by investigating architectures, analyzing data and pictures. Testicular spiral artery within spermatic cord showed cone shape, with its terminal becoming straight and branches at the middle. Testicular arteries at testis surface showed roundabout and formed tuck net shape (Fig. 1). Ovarian branch of ovarian artery showed packed coiling even at ovarian hilum, and ovarian arterioles supplying blood for follicles and corpus luteum formed at the end of ovarian hilum coiling (Fig. 2). Results demonstrate that gonads′ arterial distribution in Tibetan sheep is similar to that of cattle, and that significant differences in vascular diameters, curvature and amounts of arteriole in testis and ovary exist between lamb and adult sheep, especially there are more developed centripetal arteries in testis and spiral arteries at ovarian hilum in ovary.