Inter-calibration method for infrared channels of geostationary satellite FY-2/VISSR is introduced using the high-spectral resolution sounder （HSRS） as a reference on board a polar orbit satellite

i.e.

METOP/IASI or AQUA/AIRS. Analyses on its reliability were performed based on FY-2E historical data since 2009. The results indicate that inter-calibration results based on the two independent sensors IASI and AIRS have a good consistency between them

and the mean blackbody temperature （TBB） bias of HSRS inter-calibration is about 0.07 K with standard deviation of 1.4 K

which proves that there is no systematic bias and the distribution of TBB bias is approximately normal. Thereinto

the mean TBB bias is approximately less than 0.2 K and 1 K when TBB is great than 290 K and 220 K

respectively

and is about 0.3 K at a lower temperature. Comparing with the operational calibration provided in the Level1 f iles

HSRS inter-calibration shows obviously improvements. Longtime statistic analyses demonstrate the HSRS inter-calibration method studied here is stable and reliable

and its accuracy can meet the require-ment in quantitative applications.