A high performance capillary electrophoresis method with solid phase extraction was established for the determination of acesulfame potassium(ACE),a urine indicator in swimming pool water.The separation was performed on a fused silica capillary with uncoated inner wall(602 cm×75 μm id.,an effective length of 50 cm),using 10 mmol/L sodium tetraborate(pH 93) as electrophoresis buffer at a separation voltage of 24 kV.The sample was injected for 20 seconds at a detection wavelength of 226 nm.The swimming pool samples were directly analyzed after filtered and enriched by solid phase extraction(SPE).The results showed that,under the optimized conditions,a good linear relationship was obtained for acesulfame potassium in the concentration range of 02-1000 mg/L,with a correlation coefficient(r) of 0999 8,and a detection limit of 500 μg/L.The spiked recoveries were in the range of 960%-1036% with relative standard deviations(RSDs) for migration time and peak height of 073% and 18%,respectively.The method is sensitive,simple and reliable,and is suitable for the detection of acesulfame potassium in swimming pool water.