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In order to control diesel engine emission, several after-treatment technologies have been studied and developed to reduce particulate matter (PM) and nitrogen oxides. Such reduction is making it hard to measure the mass of such pollutants. In the present study, a new method to analyze nitrogen compounds in vehicle particulate has been described. The method is based on the technique for separate analysis of SOF, soot and sulfates in particulate, which has been previously reported by the authors. The new method utilizes oxidation process in a furnace at high temperature and a chemiluminescence detector (CLD) to measure generated NO and NO2. In this paper, principle and concept of the method has been described. In addition, feasibility of the method for analyzing nitrogen compounds in vehicle PM has been discussed, with practical experiments using modeled samples and actual particulate.