Objective Aiming at understanding the probable problem of high blank value in the determination of phthalate acid esters in foods.Methods The influencial factors such as organic solvent,the immersed time of GPC system were analyzed carefully by GB/T 21911—2008.Results DMEP、BMPP、DEEP、DPP、DHXP、BBP、DBEP、DCHP、DPhP、DNOP、DNP、DINP were not detected,whereas DMP、DEP、DIBP、DBP、DEHP were detected,the blank values were lower than 10 microg/L,respectively.Conclusion The main factors influencing the blank value were observed,therefore,measures on reducing the blank value were proposed.