Sipunculus nudus juveniles at average body weight of 15.49±0.03 mg were fed with seven isonitrogenous (45% crude protein) and isolipidic (9% crude lipid) diets containing different carbohydrate (glucose, sucrose, dextrin, tapioca starch, potato starch, corn starch, or gelatinized corn starch) for 8 weeks to investigate the effects of different dietary carbohydrate (CBH) sources on their growth, survival and body composition. The treatment fed with gelatinized corn starch showed the highest weight gain (WG) and specific growth rate (SGR), and were significantly higher than the other CBH diets (P<0.05). However, the dietary CBH sources had no significant effects on survival rate of S. nudus (P>0.05). The results of body composition analysis showed that different CBH sources had significant effects on body moisture and body protein (P<0.05). The S. nudus fed with glucose had the highest body moisture and the lowest body protein, which were significantly different from the others (P<0.05). No significant differences were observed in body lipid content and body ash content of S. nudus among dietary treatments with different CBH (P>0.05). It could be concluded that the ability for S. nudus to utilize macromolecular carbohydrates was better than that to utilize small molecule carbohydrates, and pre-gelatinization of corn starch significantly improved corn starch utilization in S. nudus based on the experiment results.