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以玉米淀粉为原料,经过超微粉碎,用柠檬酸与甘油作改性剂,合成双改性热塑性玉米淀粉,确定了双改性热塑性玉米淀粉合成工艺的最佳条件——原淀粉经超微粉碎,在反应温度120℃,反应时间60min,配料比m（含水20%的玉米淀粉）：m（柠檬酸）：m（甘油）=1：0.4：0.3下,双改性热塑性玉米淀粉的取代度是0.259,酯化度是0.346,均比单改性的大。红外光谱分析证实在淀粉中引入了柠檬酸酐,X-衍射揭示双改性淀粉的结晶度下降。“,”Corn starch used as raw material to synthesis double-modified thermoplastic starch through the ultra-fine powder and citric acid and glycerol as modifiers. The optimum conditions of double-modified thermoplastic corn starch were researched. Under the reaction time is 60 min, the reaction temperature is 120 ℃, mass ratio of micronization corn starch：citric acid：glycerol was 1：0.4：0.3, obtained that double-modified thermoplastic starch are 0.259 degree of substitution and 0.346 degree of etherification, which are all higher than single-modified starch. Infrared spectroscopy confirmed that the lemon anhydride groups were introduced in starch. The X- diffraction showed the crystalline of double modified starch were dropped.