A compound represented by Formula (III), or a stereoisomer, a geometric isomer, a tautomer or a pharmaceutically acceptable salt thereof: wherein, R 1 is selected from C 1-3 alkyl, C 1-3 alkylcarbonyl or cyclopropylmethyl; preferably, R 1 is selected from methyl, ethyl, cyclopropylmethyl or acetyl; L is selected from a single bond or C 1-3 alkylene; preferably, L is selected from a single bond or -CH 2 -; R 2 is selected from C 1-3 alkyl, 3- to 7-membered cycloalkyl, 6- to 10-membered aryl or 5- to 6-membered heteroaryl, wherein said 6- to 10-membered aryl and 5- to 6-membered heteroaryl are optionally substituted with at least one group selected from halogen, C 1-3 alkyl, amino, C 1-3 alkylamino, di(C 1-3 alkyl)amino, trifluoromethyl, difluoromethyl, cyano or C 1-3 alkoxy; preferably, R 2 is selected from C 1-3 alkyl, 3- to 7-membered cycloalkyl, phenyl or thienyl, wherein said phenyl and thienyl are optionally substituted with one or more groups that are independently selected from hydrogen, halogen, C 1-3 alkyl, amino, C 1-3 alkylamino, di(C 1-3 alkyl)amino, trifluoromethyl, difluoromethyl, cyano or C 1-3 alkoxy; further preferably, R 2 is selected from phenyl or thienyl, said phenyl and thienyl are optionally substituted with one or more groups independently selected from fluoro or chloro; ring A is selected from 3- to 7-membered cycloalkyl or 3- to 7-membered heterocycloalkyl; each R 3 is independently selected from hydrogen, C 1-3 alkyl, halogen, cyano, trifluoromethyl, C 1-3 alkoxy, C 1-3 alkyl substituted with hydroxyl, C 1-3 alkylamino or di(C 1-3 alkyl)amino; preferably, each R 3 is independently selected from methyl; m is 0, 1, 2, 3 or 4. R 1 is selected from C 1-3 alkyl, C 1-3 alkylcarbonyl or cyclopropylmethyl; preferably, R 1 is selected from methyl, ethyl, cyclopropylmethyl or acetyl; L is selected from a single bond or C 1-3 alkylene; preferably, L is selected from a single bond or -CH 2 -; R 2 is selected from C 1-3 alkyl, 3- to 7-membered cycloalkyl, 6- to 10-membered aryl or 5- to 6-membered heteroaryl, wherein said 6- to 10-membered aryl and 5- to 6-membered heteroaryl are optionally substituted with at least one group selected from halogen, C 1-3 alkyl, amino, C 1-3 alkylamino, di(C 1-3 alkyl)amino, trifluoromethyl, difluoromethyl, cyano or C 1-3 alkoxy; preferably, R 2 is selected from C 1-3 alkyl, 3- to 7-membered cycloalkyl, phenyl or thienyl, wherein said phenyl and thienyl are optionally substituted with one or more groups that are independently selected from hydrogen, halogen, C 1-3 alkyl, amino, C 1-3 alkylamino, di(C 1-3 alkyl)amino, trifluoromethyl, difluoromethyl, cyano or C 1-3 alkoxy; further preferably, R 2 is selected from phenyl or thienyl, said phenyl and thienyl are optionally substituted with one or more groups independently selected from fluoro or chloro; ring A is selected from 3- to 7-membered cycloalkyl or 3- to 7-membered heterocycloalkyl; each R 3 is independently selected from hydrogen, C 1-3 alkyl, halogen, cyano, trifluoromethyl, C 1-3 alkoxy, C 1-3 alkyl substituted with hydroxyl, C 1-3 alkylamino or di(C 1-3 alkyl)amino; preferably, each R 3 is independently selected from methyl; m is 0, 1, 2, 3 or 4. <EOS>