In this study, the field experiment was conducted to investigate the control effect of 62% Butachol·Oxadiazon microemulsion on three weeds in the transplanted rice field, including Echinochloa crusgalli L. Beauv, Cyperus difformis L. and Monochoria vaginalis (Burm.f.). Additionally, the influence of weed control on the absorption of nutrition and the yield of weeds was examined as well. The results revealed that 62% Butachol·Oxadiazon microemulsion can effectively control the three dominant weeds, with the control effects of weed density and fresh weight being 88.09%-98.91% and 88.06%-98.31%, respectively. After weed control, the light penetration rate in the rice field was significantly increased 3-4 folds, the weeds' absorption of water and nutrition was significantly decreased more than 85%, and the yield of rice was increased 33.46%-40.04%. 