S. chuatsi missing the best growing season, data of body mass, total length, body length, body depth, head length, eye diameter, tail length, caudal peduncle length, caudal peduncle depth were collected from at 2 to 6 months of age in this study. The morphological traits were analyzed by principal component and discriminant analysis. The results showed that there are different degrees of correlation among all the morphological traits at different age phases, the relationships between body mass and total length and body length and body depth are relatively higher, and that between eye diameter and other traits is relatively lower.S. chuatsi at all the age phases. The second principal componentat different months of age are different. The second principal component reflects the development of eyes from 2 to 4 months of age, while that reflects the development of head and tail at 5 and 6 months of age, respectively. The month age closely related to the size of which has missed the best growing period can be typed by employing the discriminant equations established in this paper, the method is stepwise discrimination analysis and the result shows 98.87% of accuracy. The body length-mass relation equation is which demonstrate that the body mass and length of that body mass, body length and body depth are the most important morphological traits in the early growth stage of established the discriminant equations in the early growth stage of S. chuatsi grow in similar velocity. This paper provides theoretical evidence and perfect measure targets for breeding of in the early growth stage in aquaculture