The optimal microwave puffing technology was explored using kiwifruit as the raw material. Effects of moisture,slice thickness and microwave time on expansion volume were studied by single experiments. Based on it,conditions of puffing were optimized by response surface design. The mathematic model was built between the expansion volume and three factors. Results showed that the optimum conditions of puffing were:20% moisture of kiwi slice,thickness of 4mm and microwave time of 62 s. The expansion volume wa...