Fourier transform infrared spectroscopy (FTIR) technique is widely used in the field of atmospheric environment observation. A in-situ FTIR analyzer system based on the combination of the technology of Fourier infrared spectrum and White type multiple reflection cell was used to measure the multi-species of CH4, CO, CO2 and N2O in the field of Longfengshan background GAW station, Heilongjiang, China, and its comparation with the CRDS and GC system was also carried out concurrently. The results show that, (1) the detection limit of FTIR principle prototype is a higher than that of design, which can satisfy the in-situ observation of high concentration of greenhouse gas emissions. However, there was still a certain gap between the syetem and the requirement of the WMO-GAW atmospheric background observation, which means that the domestic FTIR principle prototype has room for improvement in the detection ability (such as light energy attenuation, efficient optical path, the wavelength calibration and measurement chamber, etc.), the analysis precision, uncertainty, and the system stability, etc. (2) By comparison with CRDS and GC system, it was shown that there were a higher agreement on the trend consistency and correlation of CH4 and CO, although the trend consistency of CO2 and N2O was not very ideal, which indicates that the performance of the analyzer system might be relative to the observation system, such as original principle, analysis and detect technology, ambient sample processing, data processing and so on.