In order to meet the direct seeding requirements of the hole-seeding and fixed hill spacing for the self-developed inside-filling pneumatic type precision meter device for rice, the kinematics analysis of seed dropping process was carried out on the meter device to construct the theoretical dropping trajectory of rice seed. A novel rectangular seed spout with variable cross section was designed based on the theoretical dropping trajectory of rice seed. The effects of the bottom plate inclination angle of the seed spout and rotational speed of the seed-absorbed cylinder on hole-seeding and seeding uniformity of the meter device were analyzed by EDEM and bench seeding performance test. The results of simulation analysis showed that the maximum time difference of particles discharge per hole from the seed spout and the time interval variation coefficient of adjacent hole both increased with the decrease in the bottom plate inclination angle of the seed spout and the increase of rotational speed of the seed-absorbed cylinder. The bench test results showed that the average diameter of hole diameter and the variation coefficient of the hole spacing both increased with the decrease of the bottom plate inclination angle of the seed spout and the increase of rotational speed of the seed-absorbed cylinder. The simulation results was in agreement with the experimental results. When the bottom plate inclination angle of the seed spout was 77°, the seeding performances of the meter device were better and stable under different seeding frequency. All the qualified rates (2-4 seeds per hole) were more than 90.0%, all the miss-seeding rates (less than 2 seeds per hole) were less than 2.2%, all the replay rates (more than 4 seeds per hole) were less than 8.0%, all the average diameters of hole diameter were less than 28.33 mm, all the qualified rates of hole diameter (not more than 50 mm between the two farthest seeds in one hole) were more than 91.33%, all the average hole distances slightly fluctuated around 200.00 mm (the theoretical hole distance), and all the variation coefficient of the hole spacing were less than 11.10%, which met the planting requirements of precision direct hole-seeding for rice.