A method was developed for the analysis of unkwown compositions in a metal processing additive by Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS) combined with nuclear magnetic resonance(NMR),infrared spectroscopy(IR) and inductively coupled plasma mass spectrometry(ICP-MS).Metal processing additives with complex compositions are essential chemical products in metal production.They could easily form the chelates interfering analysis.In this paper,the metal processing additive sample was analyzed by FT-ICR MS combined with NMR,IR and ICP-MS,and sodium citrate and EDTA-Bi chelate were detected.Results showed that the method was simple and accurate,and could be applied in the rapid identification of metal processing additives containing metal chelates.