A novel method for the enrichment and determination of trace dimethyl phthalate(DMP）,diethyl phthalate(DEP）,di-n-butyl phthalate(DBP）,di（2-ethylhexyl） phthalate(DEHP） and di-n-octyl phthalate(DOP） in environmental water by ultrasound assisted dispersive liquid-liquid microextraction(DLLME） combined with high performance liquid chromatography(HPLC） was established.Experimental conditions of chromatographic separation and DLLME such as type and volume of extractants and disperser solvents,ultrasonic microextraction time and ionic strength were examined.Under the optimized conditions,the chromatographic peak areas were proportional to the concentrations of phthalates in the range of 1.00-100 μg/L with correlation coefficients more than 0.996.The average recoveries were in the range of 91%-103% with relative standard deviations(RSDs,n=5） of 2.0%-6.8% for the water sample at a spiked level of 20.0 μg?L-1.The limits of detection were 0.08,0.04,0.03,0.01,0.07 μg?L-1,respectively.This method was applied in the enrichment and determination of 5 phthalates in the real water samples with average recoveries of 85%-119% and RSDs(n=3） of 2.3%-11.1%.The developed procedure is suitable for the enrichment and determination of trace phthalates in different real environmental water samples.