The removal of trace phthalic acid esters (PAEs) in water used DK nanofiltration membrane has been investigated. The adsorption behavior and rejection characteristics of dimethyl phthalate (DMP)、 diethyl phthalate (DEP)、di-n-butyl phthalate (DnBP) and di-iso-butyl phthalate (DiBP) were also explored. It was found that adsorption isotherms of PAEs in DK nanofiltration membrane fit the Freundlich adsorption equation well. The rejection characteristics of PAEs involved in the retention of adsorption and the retention of membrane pore before adsorption reaches saturation. After adsorption reaches saturation, the rejection mechanisms of PAEs could be described pore model,and rejection rate (R) of DMP、DEP、DnBP and DiBP were 55.1%、78%、96%、96.8% (0.5MPa,30℃,PAEs concentration 300μg/L), respectively. The results indicated that the trace DnBP 、DiBP in water could been rejected very effectively by DK nanofiltration membrane.