In recent years, there have been cases of criminals using inorganic explosives such as ammonium nitrate, pyrotechnic agents, and black powder for criminal activities. By examining explosives and their explosive residues, the type of explosives and the nature of the case can be determined, providing direction and clues for investigation. At present, the main detection methods in China are chemical methods, which are cumbersome, low sensitivity, and have many interferences. Traditional methods have significant limitations. Ion chromatography, as a liquid phase branch, currently has multiple applications in environmental, food and other methods, and only requires one injection and can detect multiple anions and cations. The pre-treatment of the method is simple.