This study is based on the data of body weight and body size of 382 Meigu goats after birth in Meigu County, Liangshan Yi Autonomous Prefecture, Sichuan province. Using SPSS19.0 we compared and correlated the main growth traits of male and female Meigu goats, and we compared 3 fitting models of body weight growth, Gompertz, Bertalanffy and Logistic, to find a more precise growth model for Meigu goat's pattern . Getting these basic data is for the purpose of rationally utilizing this specie's hereditary information and scientifically proceeding breed selection in the future. The results showed that (1) Meigu male goat's body weight in three month age, six month age, eight month age and one year age were significantly higher than that of female goat during the same period. Sex has a great effect on goat weight. (2) Correlation analysis showed that there was significant difference between body weight and chest size in the control variables of height and length, and the difference of body weight with length or height was not significant after controlling the height and bust or controlling the length and bust. R2 is 0.977, so the weight can be expressed by the bust through the equation, the regression equation:Y=1.114x-48.174, where Y is weight (kg), x is the bust (cm). The difference between the true value and the predicted value is within 3.564kg. (3) Selection of 3 kinds of nonlinear growth models, such as Gompertz, Bertalanffy and Logistic, were used to fit the growth of Meigu rams and ewes, and the best model of ram growth curve was chosen logistic:W=53.94×(1 +2.74e-0.106t ) -1. The best model of ewe growth curve was chosen Gompertz：W=50.15×e-1.44exp(-0.023t) .