A 3-D, incompressible, viscous, RNG turbulence model and the SIMPLE method were used with computational fluid dynamics(CFD), and flow fields of suction cylinder-seeder with different sockets were simulated by Fluent. When under pressure was -4kPa, productivity was 350 trays per hour, row spacing of sockets was 23mm and pitch of holes was 31.4mm, the pressure was uniform, the velocity was stable. Energy loss mainly occured nearby slots and export, and there was almost no interaction among socketsslots, which indicated that sockets of cylinderseeder were distributed reasonably in axial and circumference. The hemispherical socket was more appropriate by contrasting different sockets on average turbulent kinetic energy, average vacuum and maximum velocity difference in side of slots. The experimental results showed that hemispherical socket had the best seeding performance(85.34%) which was consistent with simulant results.