Background/Introduction: Invertase, also known as sucrase or beta -fructofuranosidase, catalyzes the hydrolysis of sucrose by cleaving its glycosidic bond and forming one molecule each of glucose and fructose. According to the optimum pH, invertase is divided into acid invertase (AI) and neutral invertase (NI). AI mainly exists in cell vacuole or free space, the optimum pH is 4.5 ~ 5.0. AI regulates the use of sugar in vacuole and the accumulation of sugar in fruit through the degradation of suc