Abstract: Residual amounts of thiabendazole (TBD) and carbendazim (CBD) were extracted ulltrasonically with ethylacetate from samples of edible fungus.The extract was evaporated to dryness by N2-blowing and the residue was dissolved in 0.05 mol·L-1 HCl.TBD and CBD in dil.HCl solution was then purified by SPE.The Waters Symmetry C18 column was used as stationary phase and a mixture of phosphate buffer solution and acetonitrile (mixed in the ratio of 75+25 by volume) was used as mobile phase.UV-detection was made using diode array detector at the wavelength of 288 nm,and external standard were used for quantification.Limit of detection (3S/N) and lower limit of determination (10S/N) of the methd were found to be 0.010 mg·L-1 and 0.025 mg·L-1 respectively for both bactericides.Tests for recovery and precision were made at 4 different concentration levels,and values of recovery found were in the range of 72.0%-86.0% with values of RSD′s (n=6) less than 8.5%.