The electric heat-storage air heater as a new drying heat source for grain dryer was proved by comprehensive evaluation and data analysis of the production process parameters. The fluctuate of hot air temperature range ≤±3℃ and thermal conversion rate ≥95% without pollutant emission reached the accurate control level of output temperature and heat quantity, and solved the problems of high energy consumption, low thermal efficiency and serious pollutant emission. The allocating power of electric storage heaters for grain drying under the normal condition was determined by selection of process parameters.