Abstract: To address issues such as miss-seeding that frequently occur in seeding apparatus during high-speed operation, air-suction seeding apparatus and cotton seeds were selected as research subjects．High-speed camera captured seeding apparatus' working process, with recorded videos analyzed and processed using TEMA software．Analysis results indicated that cotton seeds exhibited three adsorption postures within seed-carrying arc segment of seeding apparatus: posture A, where large end of seed was adsorbed; posture B, where small end of seed was adsorbed; and posture C, where elliptical surface was adsorbed．Theoretical calculations revealed that posture B required the smallest suction force to maintain．Under identical vacuum pressure conditions, cotton seeds adsorbed in posture B exhibited the highest stability．Cotton seed velocity and acceleration analysis showed unstable velocities when adsorbed in posture A and posture C exhibit, while more stable velocities were adsorbed in posture B．Additionally, a transformation from posture A and posture C to posture B was observed．Research found that posture B is optimal seed-filling posture．