Controlling of root rot, Sclerotinia sclerotiorum（Lib） De Bary and cyst nematode of mungbean withseed coating was studied in the paper. 28% Kefuduo seed coating agent to Mungbean with high control efficiencyand high security was selected by bacteriostatic test, indoor control experiment, field plot control test and large areaextension test. Its control efficiency on root rot, Sclerotinia sclerotiorum（Lib） De Bary and cyst nematode was 81.5%, 59.66% and 80.5%, separately. This control method is sample, low cost and easy.