This study aimed to characterize the feeding habits of juvenile Miichthys miiuy， an important economic fish species in the coastal waters of Jiangsu， and to identify the factors influencing their feeding ecology， so as to reveal trophic strategies during the juvenile stage and provide a scientific basis for resource conservation and management. Based on 865 juvenile M. miiuy samples collected from the Jiangsu coastal area during 2024-2025， stomach content analysis was applied to systematically investigate diet composition， feeding intensity， and feeding strategy. Environmental factors were also incorporated to analyze their effects on feeding habits. The results showed that the diet of juvenile M. miiuy comprised eight prey categories， including shrimps， fishes， and stomatopods. The dominant prey species were Leptochela gracilis （I=22.7%）， Alpheus japonicus （I=18.7%）， Metapenaeopsis dalei （I=18.4%）， and Oratosquilla oratoria （I=14.3%）. The juveniles exhibited a broad feeding spectrum and high phenotypic plasticity in the trophic niche. Diet composition varied significantly between seasons： although the empty stomach rate did not differ significantly between spring and autumn （P>0.05）， the average stomach fullness index showed a highly significant difference （P<0.01）. Diet composition also shifted with body length： empty stomach rate differed significantly among body-length groups （P<0.01）， whereas the average stomach fullness index did not （P>0.05）. Body length， geographic coordinates （latitude and longitude）， bottom water temperature， bottom salinity， dissolved oxygen， and pH were identified as key factors influencing the feeding habits of juvenile M. miiuy. This study demonstrates that juvenile M. miiuy in Jiangsu coastal waters display generalist feeding characteristics， with feeding habits shaped by both ontogenetic development and environmental conditions. The findings provide a theoretical foundation for understanding the feeding ecology of juvenile M. miiuy， nutrient dynamics in local food webs， and the development of resource enhancement and sustainable utilization strategies.