To investigate the effects of different dietary ginger powder levels on performance and immune function of laying hens, 675 Hyline brown laying hens at 27 weeks of age were allotted into 5 treatments with 5 replicates per treatment and 27 hens per replicate. Laying hens were fed diets supplemented with 0, 0.5%, 1.0%, 1.5% and 2.0% of ginger powder replacing equivalent wheat bran in the basal diet formulation for 70 days, respectively. Results showed as follows: the suitable dietary level of ginger powder significantly increased the egg mass, the laying rate in 3 to 4 weeks of the trial and the average egg weight in 1 to 2 weeks of the trial (P<0.05), reduced the ratio of feed to egg in 5 to 6 weeks and 9 to 10 weeks of the trial (P<0.05), but had no significant effects on the average daily feed intake of laying hens (P>0.05). Besides, laying hens fed the diets supplemented with the suitable level of ginger powder had a higher Avian influenza H9 and H5Re-5 antibody titer in the serum and the number of granulocyte in the blood at d 70 of the trial (P<0.05). The effect of 1.0% ginger powder was the best. In conclusion, ginger powder can improve the performance and immune function of laying hens, and the suitable supplemental dosage of ginger powder is 1.0%.［Chinese Journal of Animal Nutrition，2011，23（3）：459-465］