This paper addresses the intercalibration of the two split-window channels IR1（10.9μm） and IR2（11.9μm） of SVISSR（Stretched Visible and Infrared Spin Scan Radiometer） onboard the geostationary satellite FY-2C（FengYun 2C） against the most accurate and stable AIRS（Atmospheric Infrared Sounder） sensor onboard the polarorbit satellite Aqua.The intercalibration was implemented using both the AIRS and SVISSR data around the equator in December of 2006 and 2007.The results reveal that:（1） the SVISSR data are highly linearly correlated with the convolved AIRS data

（2） calibration errors exist in SVISSR channels IR1 and IR2

and（3） the discrepancies become larger with time increment.With respect to the AIRS/Aqua measurements

when the brightness temperatures in SVISSR channels change from 220K to 340K

the temperature adjustment for IR1 in Dec.

2006 varies from 5.8K to -4.4K

and changes from 6.9K to -5.1K in Dec.

2007;The temperature adjustment for IR2 in Dec.

2006 goes from 2.2K to -1.5K

and varies from 6.3K to -6.1K in Dec.

2007.