In this study, 1175 samples of Gymnocypris przewalskii przewalskii, which were collected from the Qinghai Lake from May, 2002 to July, 2003, were aged by determining the annuli of otoliths. Regressive body length was used to fix the Von Bertalanffy function. Otoliths are good materials in age determination, which have relatively clear annuli and are unlikely to lose annuli because of absorption or erosion. Besides, the growth rates were calculated from the ages of these fish samples. The survey during the period from May to August showed that the sex ratio of males to females in the brood stock was 1.66 to I This is consistent with the results of the statistics in the 60s and 90s of the 20(th) century. In all the brood stocks, the body length and body weight of the smallest male individual at the age of 4 was 130. 0mm and 28.0g, respectively, while the body length and body weight of the smallest female individual at the age of 5 was 170.0mm and 51.0g, respectively. The age composition was from 4 to I I The mean body length and body weight of female were bigger than those of male. The body length and body weight was in the relation of power function. The relationship of body length to body weight for the female was W = 0.000174 X L-2.49899, and that for the male W = 0.0000402 x L-2.75382. There was a significant difference in growth between the female and male. Their growth could be described by Von Bertalanffy equations L-1 = 551.9301 [1-e(-0.07112(t+0.3044))] (female), L-1 = 682.8688 [1-e(-0.05304(t+0.4240))] (male), W-t = 1237.3431 (1-e(-0.0711(t+0.3044)))(2.4990) (female), W-t = 2567.3242 (1-e(-0.0530(t+0.4240)))(2.7538) (male). The inflection points for the growth of female and male were 12.57 and 18.67, respectively. Otolith described the growth of Gymnocypris przewalskii przewalskii well, scale and dorsal fin Spine Could not do better.