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It is significant to investigate the action of nitrogen getters, which are used to synthesize type-Ⅱa large diamond single crystals under high pressure and high temperature (HPHT).The reaction mechanism of A1 as a nitrogen getter and N in the HPHT alloy solvent is still indeterminate at present.In order to investigate the reaction of Al and N in the HPHT alloy solvent, Al and AlN are respectively added to the system of FeNiCo-C (wt%, abbr.FeNiCo-C) for the synthesis of diamonds at about 5.5 GPa and 1600 K.The concentration of nitrogen in the diamonds is characterized by a micro Fourier transform infrared (micro-FTIR) spectrometer.The experimental results show that c decreases when Al is added to the FeNiCo-C system.However, it increases when AlN is added.A reversible reaction confirms that Al and N can react and form AlN, simultaneously A1N can be decomposed into Al and N in the HPHT alloy solvent.Therefore the mechanism of eliminating the nitrogen of nitrogen getter Al is realized in detail.