Abstract: Based on the single factor experiments,length,water content,microwave power and puffing time were trial factors,the comprehensive score was the response value,the optimum process conditions were obtained by response surface methodology.Combined with the actual conditions,the result showed that the optimum process parameters were 3.3 cm,16.0%,690 W and 21 s for length,water content,microwave power and puffing time,respectively.The comprehensive score was 8.15 and the content of polysaccharide was increased by 15% under the optimized conditions.