To investigate organophosphoms pesticide residues of spinach in Chaohu city.100 samples were gathered randomly in the market in Chaohu since October 2008 to May 2009. 7 kinds of pesticides in common used on spinachy were detemtined by GC-MS. 25% of the samples had been detected containing organophosphorous pesticide,and the the content of 3% samples was higher than the standard.