The HITRAN database is vital for building a retrieval algorithm of CO2 concentration from satellites. Six versions of HITRAN have been published

and HITRAN2012 is currently available. These HITRAN versions have different molecular spectral parameters. This study applies the line-by-line radiative transfer model to simulate gas optical depths and transmittances at the 1. 6μm channel of TanSat for three recent versions（ 04

08

and 12） of the HITRAN database. The differences of these databases are compared. The optical depth of version HITRAN2004 is larger than that of the other two versions in gas optical depth

leading to an underestimation of CO2 concentration by 38 ppm. Meanwhile

the result of version HITRAN2008 is similar to that of version HITRAN2012

with a maximum deviation of 2 ppm. The sensitivity of CO2 column density and its near-surface value to the different HITRAN versions is also analyzed. The CO2 column density is more sensitive to version HITRAN2004 than to the other two versions. This density shows similar sensitivity to versions HITRAN2008 and HITRAN2012. Minimal differences are also detected between the two convolved radiative signals with the same slit function.