In order to study the adaptability of seed meter with variable capacity model-hole roller to different seeds, mung bean, sesame and sorghum in particle size of 1-5 mm were chosen in the test of seed metering to analyze the adaptation parameters including uniformity, consistency and breaking rate. The results showed that the seed meter with variable capacity model-hole roller is suitable for in drill sowing of sesame and sorghum, but not for seed metering of mung beans. Through the orthogonal test, the effect of the rotating speed, the form and the width of adjustable tongue and the gears for adjusting seeding rate on the uniformity, consistency and breaking rate of sesame and sorghum were analyzed, and the best combination of parameters was obtained.