The atmospheric correction algorithm for the TIR band of AMTIS(airborne multi-angle TIR/VNIR imaging System)was presented.This algorithm is suitable for the case in which no atmospheric profile is available.Three parameters are considered in this algorithm: the atmospheric equivalent temperature is determined from the image itself by using a "minimal standard deviation" method or the local air temperature near the surface;the transmittance is calculated from the water vapor content of the column,which can be determined from the surface absolute humidity or from sunphotometer;the emissivity of the pixel is determined from NDVI.The atmospheric correction result is validated by using synchronous experiment data,and the precision of brightness temperature is less than 1.2 K,which is acceptable when the atmosphere profiles is not available.