Abstract: In order to solve the problems of combustion theory unclear, pollutant generation and emission in baled straw combustion technology,a four-stage test platform with independent air distribution for baled straw combustion trials is designed independently based on staged combustion principle. The platform can easily set various test parameters and automatically save and export the required test data. By baled corn combustion trial,the results indicate that when air distribution flow is set at 70,30,10,0 m~3/h,the combustion effect is good. NOxand SO2 average emission concentration meets the requirements of（GB13271-2014）. Combined with material weight loss curve and furnace temperature field analysis,the combustion process of straw bales can be divided into four stages: early combustion,volatile combustion,coke combustion and late combustion. The reaction time of each stage accounts for about 10%,15%,50% and 25%.