As to two CCD cameras in the same HJ-1 satellite,a new cross calibration method was proposed based on image simulation.Through the method,un-calibrated CCD without obtaining the image of a target was cross-calibrated by calibrated CCD covering the target by analyzing the mathematical relation of digital counts between two CCD cameras.The calibration coefficients of A2CCD and B2CCD in October 2008 were achieved with the method and validated by using field experiment data of Gongger test site and MODIS data o...