[Objective] Near infrared spectroscopy(NIRS) technology was used for establish quantitative analysis model of ammonium chloride adulterated milk. [Method] Ammonium chloride is a kind of typical adulterated substance used to increase the nitrogen content of milk.The calibration models were built with infrared diffuse reflection spectrum and the near-infrared transmission spectrum of the samples with a pretreatment with trichloroacetic acid and then were validated. [Result]The root mean square error of cross(...