The fertilizer-herbicide granule with effervescent agent coating was prepared to increase the herbicide release rate. The effervescency of the granule enjoys a remarkable performance, which was evaluated with the methylene blue spectrophotometric method. The experiments revealed the release kinetics of mefenacet and bensulfuron-methyl (BSM) in the granule. The results show that the release equilibration time of mefenacet and bensulfuron-methyl in the effervescent granule is 15 and 11min, respectively, 33.3% and 36.7% of that in the common fertilizer-herbicide granule. The release kinetics of mefenacet and bensulfuron-methyl follows the dual constant equation and Logistic equation, with a correlation coefficients highly significant (P< 0.001). Their release rates are controlled by the Boyd film diffusion model and the Kannan-Sundaram intraparticle diffusion one.