Abstract: In order to analyze the influence of operating mode parameters of cupule-type disseminator and structural parameters of suction nozzle on adsorption properties and blocking of the suction nozzle for rice seedling, ANSYS 12.0 / Fluent were used for making simulated analysis of the airflow field of 3-types nozzle on different boundary conditions. The results of numerical simulation orthogonal test and single factor test indicated that suction nozzle lead had little effect on rate of voiding and rate of repeating suction, but it was helpful for reducing suction nozzle blocking to reduce suction nozzle lead. The maximum suction distance of suction nozzle was about 2 mm, the simulation conclusions consisted with the laboratory tests. The study can provide references for optimization design of suction nozzle and work parameters selection in cupule-type disseminator for rice seedling.