Despite the recognition that increased suspended solids is harmful to aquatic organisms, studies on the responses of them to suspended solids are limited. The present study determined ecotoxicology risk of suspended solids by evaluating the effects of suspended solids on survival rate, weight gain rate, RNA/DNA ratio and DNA damage of postlarvae. The results suggest that suspended solids have little influence on postlarvae in low concentration groups(<500 mg/L), while in high concentration groups (500 mg/L), the suspended solids could increase the survival rate of the postlarvae due to lower cannibal rate, but decrease the weight gain rate and has significant positive relationship with parameters such as comet cell rate, tail length and tail moment clearly increased tail length and tail moment were more sensitive as comet indicators of DNA damage than comet cell rate. These results suggest that RNA/DNA ratio and DNA damageMarsupenaeus japonicus