Abstract: This paper studied on the effect of calcium hydroxide on thermodynamic properties of millet dough and qualities of millet noodles,and the mechanism was analyzed. The results showed that the addition of calcium hydroxide had significant effects on the hot-water swelling power,pasting property and endothermic enthalpy of millet flour. When adding 0.1% calcium hydroxide,the hot-water swelling power was the highest,and when adding 0.1% calcium hydroxide,the cooking loss was the lowest. However,continuing to add calcium hydroxide,the cooking loss increased. Due to the presence of calcium hydroxide,the starch gelatinization process was accelerated and the endothermic enthalpy was reduced. Moreover,at this time,the sensory quality and texture characteristics of millet noodles were better,comprehensive acceptability was the highest,and the protein aggregation degree was higher. The microscopic network structure of the internal starch gel was more uniform and compact than the pure millet noodles.