There are extremely significance effects of structural parameters of nozzle distributor on gas-solid two-phase flow characteristics of fluidized bed．And this study aims to explore fluidization characteristics of the rapeseed (Brassica rapus)and pulsation law of air velocity in the fluidized-bed dryer． Thereby to clarify influence of the plate convexity，opening angle，and opening petal number on the airflow distribution performance of nozzle distributor．Then the optimization scheme of structural parameters was proposed．Based on the distributor of the open porosity ratio of 15．84% and uneven circular holes arrangement．The plate convexity (2 mm，5 mm，and 10 mm)，opening angle (0°，5°，and 10°)，and opening petal number (four petals，six petals，and eight petals)was optimally designed through numerical simulation software of Fluent based on Euler/Euler two-fluid model and standard k-ε turbulence model． Then verify it by experiment．The results showed that plate convexity of 5 mm，opening angle of 5°，and four opening petals were the optimized structure parameters of nozzle distribution for the rapeseed fluidized bed drying．The nozzle distributor of convex plate made the rapeseed (Brassica rapus)evenly distribute compared with the parallel plane．And the variance of average volume fraction of rapeseed (Brassica rapus)is 0．0073 (minimum)for the nozzle distribution of plate convexity of 5 mm，with the result that the rapeseed (Brassica rapus)fully mixed with hot air and evenly distributed．The opening angle of 5° was optimum value for the rapeseed fluidized bed drying，which was favorable to the pulsating flow of the rapeseed (Brassica rapus)．Nevertheless，the opening petal number had no significant effect on the airflow distribution performance of nozzle distributor．The four opening petals can cause that the hot air and the rapeseed (Brassica rapus)would be redistributed equably in whole region of fluidized bed compared with the other opening petals．The drying kinetics curves of nozzle distributor of variable plate convexity，opening angle，and opening petal number were comparative analysis based on experiment data，which showed that the drying rate of nozzle distributor with plate convexity of 5 mm，opening angle of 5°，and four opening petals was the biggest compared with the other types． Thus，these structural parameters of nozzle distributor were the optimum．The results of numerical simulation and experiment were consistent．The results testified that the optimized best nozzle distributor was reasonable and feasible．Therefore，the nozzle distributor is an ideal gas distributor to increase the rapeseed drying rate for the engineering application．At the same time， this research provides also a theoretical reference for the design of fluidized-bed dryer．