In order to observe two kinds of greenhouse gases,CO_2 and CH_4,making the biggest contribution to global warming, a ground-based Fourier transform near-infrared spectral remote sensing system was developed to record the perpendicular inci-dence sun spectra from February 2012 to April 2013 in Hefei continuously.The measured total transmittances in the atmosphere were obtained from perpendicular incidence sun spectra.Methods of line-by-line and low-order polynomial approximation were used to model the total atmospheric transmittances in forward model.The measured transmittance spectra were fitted iteratively using the modeled transmittance spectra in the regions of CO_2 6 150~6 270 and CH_4 5 970~6 170 cm~(-1) in order to obtain their column concentrations.The column-average dry-air mole fractions of CO_2 and CH_4 were obtained with the internal standard function of O_2 column concentrations.CO_2 and CH_4 daily average values of column-average dry-air mole fractions changed with a larger fluctuation and obvious seasonal periodicity.Their monthly average values were consistent as a whole,although there were different characteristics.Compared with the results reported by Japanese greenhouse-gas satellite in the area of Waliguan, there was a time lag corresponding to peak and trough of CO_2 content and the change from peak to trough costed a long time. CH_4 content showed variation tendency of unique peak and trough,higher in summer and lower in winter,compared with aver-age values of nationwide CH_4 column concentrations based on SCIAMACHY data.The variation characteristics were related to complex factors such as the balance of source and sink,meteorological and climate conditions,and required long-term observa-tion and further study.