A method of high performance liquid chromatography(HPLC) with magnetic solid phase extraction(MSPE) was developed for the determination of four benzoylurea pesticides,ie.forchlorfenuron,penfluron,hexaflumuron and lufenuron in irrigation water.A magnetic metal organic framework sorbent(Fe3O4-NH2@MIL-101) was fabricated via solvothermal method.The composition and morpholgy of the composite were characterized by scanning electron microscopy（SEM）,Fourier transform infrared spectroscopy(FT-IR) and X ray diffraction（XRD) analysis.Meanwhile,the magnetic intensity of the material was detected with a vibrating sample magnetometer.The determination of four analytes was performed by HPLC with the synthesized composite as MSPE adsorbent.The adsorption and elution factors，including adsorbent amount,adsorption time,pH value,elution time and elution volume,were investigated.Under the optimum conditions,the calibration curves for four benzoylurea pesticides showed good linear relationships in the range of 0.010-3.0 mg/L with correlation coefficients(r) higher than 0.999 5.The detection limits and the quantitation limits were in the ranges of 0.03-0.09 μg/L and 0.10-0.30 μg/L,respectively.The recoveries at three spiked levels ranged from 81.7% to 95.4% with RSD less than 10%.With a simple pretreatment process and an extraction time within 15 min,the method could be applied in the analysis on trace residues of benzoylurea pesticides in irrigation water.