Herbicide as the major types of pesticides, is used to control or kill unwanted plants. Theproblems of herbicide residue has been paid more attention in the resent years, since it’s wide usage. Inthis paper, trhe residues of three most commonly used herbicides of alachlor, acetochlor and atrazine incorn were analysis by the method of gas chromatography-mass spectrometry (GC-MS). The recentlydeveloped new sample pretreatment method of employed dispersed solid phase extraction (DSPE) wasemployed in this study...