In order to understand the growth pattern of shell morphology and body weight of young Hyriopsis cumingii cultured in cage, the non-linear growth models, Logistic, was used to describe the 4 morphological traits and body weight of young H. cumingii (Fig. 1). The results showed that the growth of young H. cumingii conformed to the Logistic growth model. Three growth parameters of the Logistic growth model were estimated by Levenberg-Marquardt iteration method, and the growth limits of the morphology and weight traits of the young H. cumingii were obtained in the observation cycle. They were 9.216 cm for shell length, 4.985 cm for shell height, 2.212 cm for shell width, 8.262 cm for height and 75.240 g for weight, respectively (Table 1). The cumulative growth of 4 morphological traits and body weight overall appeared first quick back slow trend (Fig. 2﹣4). The fastest growth intervals of the morphology and weight traits were, shell length 2.211﹣5.181 months, shell height 2.107﹣5.363 months, shell width 2.712﹣5.470 months, height 2.294﹣5.026 months and weight 4.247﹣8.065 months, respectively (Table 2). The weight had obvious growth retardation phenomenon. The instantaneous growth rate curve of all traits was bell shaped (Fig. 5), and it increased to growth inflexion point first and then it decreased gradually. The instantaneous growth acceleration curve was inverse “S” type curve (Fig. 6), and it had the highest point and the lowest point. The relative growth rate at the beginning of farming was highest, and then gradually decreases (Fig. 7). These results will provide theoretical guidance for ecological research and selective breeding, and provide reference for freshwater pearls grafting and culturing.