Abstract: In order to study the early growth rules of Leizhou black ducks, three growth curve models (Logistic, Gompertz and Von Bertalanffy) were used to fit and analyze Leizhou black ducks from 0 to 16-week-old weight. The results showed that the growth curves were appropriately fitted with all three models and the best one was Von Bertalanffy model for both male and female ducks. Analyzed from the Von Bertalanffy model, the goodness-of-fit of male duck growth curve was 0.995 and that of female duck was 0.998. In addition, the weeks and weights of inflection piont of male duck were respectively 5.17 weeks and 506.76 g, which were higher than those of female duck (4.66 weeks and 458.01 g). Moreover, the best market age of Leizhou black duck was 10-week old. As a result, it was necessary to meet nutrition supply as far as possible in the first 10 weeks during growth and development in actual production to achieve the goal of furthest increase of body weight and gain the greatest economic benefits.