Objective:AA broilers were fed on Cortex Encomia compound and studied its effect on immune function through detecting HI level of antibody of Newcastle disease（ND）.Methods:Two hundreds and twenty-four AA broilers were randomly divided into four groups

including a control group and three groups given Cortex Encomia compound.All groups had been investigated for 42 days.Every group took the same immunity approaches and blood was taken from AA broiler’ heart.Results:After injection two or three weeks

in the Cortex Encomia compound groups the level of HI antibody were higher than the control group.The high dosage group was very remarkable compared to that of the controls（P<0.01）;The low dosage group and the middle dosage group were remarkable compared to that of the controls（P<0.05）.Conclusion:Results showed that the Cortex Encomia compound was effective in enhancing immunity for Newcastle disease（ND）.