Abstract: The dynamics parameter of gelatinization of maize starch under high pressure was calculated. The results show that the reactions, produced by high pressure and by heating are belong to first stage reaction. According to this result and the heating gelatinization dynamics,the gelatinization dynamics equation of maize starch under high pressure was achieved.The mechanism of maize starch gelatinization and the factor of gelatinization rate under high pressure was also explained.