In this article, four factors affecting seed damage rate and loss rate are analyzed by orthogonal test on picker. The results show that, the first effect on seed damage is seed water content, the second is ejector roller speed and shape of picking board, and the last is moving speed of picker; the first effect on seed loss is ejector roller speed, the second is shape of picking board. When work on low seed water content(≤30%), curving picking board, moderate ejector roller speed(600～700 r/min), the quality of picker is the best.