Abstract: In order to investigate the state of residuals and the degradation dynamics of butachlor and bensulfuron methyl in farmlands, soils and crops were sampled from two representative plantation areas in the suburbs of Nanjing in June and November 2019, respectively. Then, an analysis was conducted for the butachlor and bensulfuron methyl residues contained in the collected samples through high-performance liquid chromatography (HPLC-UV). The degradation dynamics of the herbicides were explored through the simulation performed under laboratory conditions. The detection rate of butachlor and bensulfuron methyl reached to 54.55% and 63.64%, respectively, while the maximum concentration of butachlor and bensulfuron methyl residues reached to 1.578 and 0.102 mg·kg^-1, respectively. Besides, there was a significant difference found in the content of butachlor residue between the two sampling areas(P < 0.01). Bensulfuron methyl residue was found to be negatively correlated with soil organic matter, but positively related to pH value. While butachlor residue was revealed to be negatively correlated with soil organic matter, but irrelevant to pH value in acidic environment. According to the results of simulation test conducted in the laboratory, the degradation dynamics of bensulfuron methyl and butachlor conformed to the first-order kinetic equation. Moreover, their half-lives reached to 7.94 and 13.08 d, respectively, while their dissipation rate was 0.087 and 0.053 d^-1, respectively. The amount of herbicide residue in farmland soil was related to the characteristics of its degradation.