The small yellow croaker(Pseudosciaena polyactis) is an important marine fish species and widely distributed throughout the Bohai Sea, the Yellow Sea, and the East China Sea of the Northwest Pacific Ocean. Grey relational analysis was used in this study to examine the relationship between morphological traits and body weight of the small yellow croaker. Body weight and 8 morphological traits(including total length, body length, head length, trunk length, tail length, caudal peduncle length, caudal peduncle depth, and body depth) were measured and analyzed. The results show that the average body weight of female was significantly greater than that of male. The coefficients of variation in body weight(30.598 for female, 27.055 for male) were greater than morphological traits(9.941-12.543 for female, 8.170-13.295 for male). The grey relational degrees between morphological traits and body weight were in the interval of 0.5266-0.6812 for female, 0.5284-0.7116 for male. The descending relational order of the morphological traits in the female samples was total length > body length > trunk length > tail length > caudal peduncle length > body depth > caudal peduncle depth > head length. That of male samples was total length > body length > tail length > trunk length > caudal peduncle length > caudal peduncle depth > body depth > head length. In all the samples, the grey degree of total length was the highest and followed by body length, and the head length was the lowest both in the female and male. This study provided scientific basis for the small yellow croaker breeding selection on growth traits.