Abstract: Aimed at the original design of automatic removing impurities and sorting fruit device with roller sieve，3 problems in the testing process were found.The first one is that sieve mesh was made by stainless steel wire mesh，and steel wire was thinner.In actual processing，raw materials would damage the fruit.The second one is that part of steel wire sieve mesh cross was narrow，impurities would be clamped in the operation.In addition，other part of impurities were soft and slender，after working for a long times，impurities would be wound on the screen.It would result in decreased efficiency of removing impurity.The last one is that effect of lower part of screen in operation is used to remove cylindrical nip rollers that carry impurities on screen was poor.Aiming at above problems，parts with existing problems were redesigned.The screen，impurity picker and top structure of screen had been greatly improved.