Abstract: In this study,the rice bran protein-arabinoxylan conjugate was prepared by Maillard reaction under wet conditions. Based on the degree of grafting index,the single factor and Box-Behnken response surface experiment were carried out to optimize the preparation conditions of conjugate. The results showed that the optimal preparation processes of conjugate were as follows:The pH of the grafting reaction solution was controlled at 10,the grafting reaction time was 48 min,the ratio of arabinoxylan to rice bran protein was 2.2:1,the grafting reaction temperature was 50℃. The degree of grafting was 34.01%. Compared with the rice bran protein,the conjugate had higher water holding capacity,emulsification and emulsion stability,which improved utilization of rice bran protein in the food industry.