Abstract: In order to improve the seed scattered uniformity to storing device of plot seeder, it was taken as the research object in the paper. Influence of the three test factors (diameter of storing device (d), lifting height of storing device (h), motion velocity (v)) on the scattered uniformity about black sesame seed, Chinese cabbage seed, rape seed, wheat seed and soybean seed were analyzed by the orthogonal rotational combination experimental design. With DPS7.05 Data Processing System the regression equations of seed scattered uniformity on the three test factors were established. The effect order of three factors on each seed was obtained by the regression equations. Optimum parameters about structure and operational environment were established by analysis and under the respective optimum parameters the CV of the scattered uniformity about black sesame seed, Chinese cabbage seed, rape seed, wheat seed and soybean seed were 2.2121%, 1.0388%, 0.9198%, 2.6328%, 2.7188%, respectively. Under the same weight, the integral optimum parameters were as follows: diameter of storing device 0.0634 m, lifting height of storing device 0.013 m, motion velocity 1.4524 m/s and the best CV of the scattered uniformity about black sesame seed, Chinese cabbage seed, rape seed, wheat seed and soybean seed were 2.4741%, 1.3008%, 1.1818%, 2.6415%, 2.9808%, respectively. The study has certain practical value for improving the adaptability of storing device to seed and uniformity of sowing in the plot.