The invention relates to an inhibitor compound for acetolactate synthetase AHAS, which is indoline diketone compound (I); wherein, R1 is H or CH3, R2 is O or N-OH, R3 is F, Cl, Br, I, CH3, OCH3, NO2, SO3H, OCF3 or CF3, R4 is F, Cl, Br, I, CH3 or OCH3. The inhibitor compounds for acetolactate synthetase has the advantages of having herbicidal activity, having inhibiting action upon arabidopis thaliana aceto-lactic acidsynzymeas well as upon growth of rape root and being used for designing new environmentally friendly herbicide molecule.