In order to optimize the structure-parameter of gas distributor for the rapeseed fluidized bed dryer, the open porosity ratio and the arrangement holes mode of gas distributor were optimized through numerical simulation software of Fluent based on Euler two-fluid model and standard k-ε turbulence model. The results showed that open porosity ratio of 15.84% and uneven circular holes arrangement were the optimized structure-parameters of gas distribution for the rapeseed fluidized bed drying, which enhanced liquidity of hot air, reduced hot air to gather in the local area, made gas-particle two phase flow normally fluidize, and achieved the homogenized distribution of rapeseed particle in fluidized bed without channeling phenomenon and dead zone. The simulation results were verified through the experiment. The drying kinetics curves of gas distributor of different open porosity ratios and arrangement holes modes were comparative analysis based on experiment data, which showed that the drying rate of gas distribution with open porosity ratio of 15.84% and uneven circular holes arrangement was the biggest compared with the other types. Therefore, the gas distribution with open porosity ratio of 15.84% and uneven circular holes arrangement was the optimum. The results of numerical simulation and experiment were consistent. The results testified that the optimized best gas distribution was reasonable and feasible. Therefore, the gas distribution is an ideal gas distribution to shorten the rapeseed drying time for the engineering application.