Abstract: Long rice(Oryza sativa subsp.hsien) starch hydrolyzed by α-amylase was partly used as fat substitute in low fat mayonnaise.The gel properties of the rice starch dextrins with different DE value were studied.The effect of different DE rice starch content on the quality of mayonnaise was also assessed.The results showed that DE value increased between 1.5 to 2.5,the viscosity,adhesion and resilience of the rice starch dextrins gel all enhanced except the hardness,chewiness and intensity.The G'(Storage modulus) and G″(Loss modulus) of mayonnaise were increased as temperature rises,which were independent on the fat substitute rate.Dextrins with DE value of 1.5 and substituted for 30% of fat had the best sensory quality.