Improve HJ-1B B08 on-board absolutely radiometric calibration precision by virtue of a constructed lookup table （LUT） method that fit for HJ-1B B08 characteristic to calculate its effective bandwidth.LUT method is based on HJ-1B on-board radiometric calibration theory

pre-launched experiment datum and Planck formula.As a result

HJ-1B B08 effective bandwidths are 2.01μm

1.940μm and 2.394μm corresponding to LUT method

FWHM method and moments method（MM）. LUT method has low association to blackbody temperature

and the relative difference is 0.3%between normal temperature and high temperature state.FWHM method and MM method are either higher or lower

and the calibrated top of atmospheric（TOA） radiance is either lower or higher

so they are not fit for HJ-1B B08 characteristic.LUT method gives a result that very close to field experiment

and the absolutely error is 0.04 W·m

-2

·sr

-1

·μm

-1

corresponding to approximately 0.4 K TOA radiant temperature error

so it can be better when used to HJ-1B B08 on-board absolutely radiometric calibration.