A 60 d study was conducted to evaluate the effect of Schizochytrium biomass(DHA-rich) on the growth performance and nutritional components in the muscle of juvenile white shrimp (Penaeus vannamei). There were 5 treatments including control and control with Schizochytrium,five dietary levels (0%, 0.2%, 0.5%,1.0% and 1.5% of diet) of Schizochytrium biomass. Each treatment had 6 replicates and each replicate had 180 shrimps(initial shrimp size was around 2.5 cm). The results showed that：Although there are no statistical significant differences among all treatment groups in final body weight, body weight gain, relative weight gain, feed conversion and survival rate, the addition of DHA from Schizochytrium numerically improved body weight gain and feed conversion. There were no significant differences in the contents of crude fat and ash of muscles(P>0.05),but the crude protein and DHA in the crude fat were significantly higher than that of the control(P<0.05).In conclusion, Schizochytrium biomass(DHA-rich) could improve the growth performance of the white shrimp, and improve the nutritional quality of muscle. The recommended dosage was 0.5%.