In order to reach the sensory requirement of the apple dietary fiber,the combination of ultrasonic irradiation and ozone technology was apply on the discoloration process of the apple dietary fiber. Through single-factor test and orthogonal test,the optimal discoloration technology parameters were as follows: 15 g / h of ozone generation, 70 kHz of ultrasonic frequency,6% of sodium hydroxide concentration,1∶ 25 of the ratio of material to liquid( g: mL),and reaction time 5 h. Under these conditions,the L value of the discolored dietary fiber reached 80. 11. Results from this study indicated that the combination of ultrasonic irradiation and ozone was an effective discoloration method. Compared with the decolorizing technology by H 2 O 2,the combination of ultrasonic irradiation and ozone technology had not only solved the problem of solvent residues,but also had a remarkable effect on discoloaration.