Abstract: The major impurity of imidacloprid technical material named 1,3-bis-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine(BPMNA) was synthesized and a rapid high performance liquid chromatography (HPLC) analytical method for BPMNA has been established.The results showed that the regression of the peak area of BPMNA on the concentration well fitted a linear relationship(R2=0.999 7) at the concentration levels ranging from 0.5 to 25.0 mg/L.The LOD and LOQ were 0.01 and 0.1 mg/L,respectively.The relative standard deviations (RSD) for 5 parallel determinations were less than 1.0%.Standard additions of BPMNA to imidacloprid standard as matrix lead to excellent recoveries of 99%-101%.The method presented here stands out as simple and easily applicable,which can be applied directly to commercial imidacloprid formulations to provide a rapid and efficient quality control.