Abstract: Different chlorimuron-ethyl residue, the effects of different dosages of bio-fertilizer on the rice roots and yield components were simulated in the plot experiment. The results showed: the rice would be damaged by low chlorimuron-ethyl concentration. When the amount of chlorimuron-ethyl≤0.5mg/kg, the bio-fertilizer could degrade it significantly. It could impair the polluted soil, promote the growth of root, increase the grains per panicle of rice, panicle number of per hill and increase the yield. When the chlorimuron-ethyl amount was 6mg/kg, bio-fertilizer could not degrade the herbicide. From the comparison of every treatment, the best economy amount of bio-fertilizer was 30kg/hm2.