34 gingers were screened for their inhibitory effect on α-glycosidase in order to obtain a functional component to control the postprandial blood glucose and thus improve the additional value gingers. Using in vitro screening model,the best extraction solvent and the ginger cultivars with the strongest inhibitory effect were determined based on the inhibiting rate. The type of enzyme inhibition was determined based on enzyme concentration-reaction speed and L-B graphing method. Ginger extract with ethanol showed the highest inhibition rate of 66. 2%. The little turmeric of luoping Yunnan showed the highest inhibition rate of 88. 58%. The type of enzyme inhibition was non-competitive inhibition of the reversible inhibition. α-glycosidase inhibitor existed in the ginger and the inhibition effect was remarkable.