Abstract: With the background of the next generation of geostationary orbit meteorological satellite,the effect of payload mirror motion and solar array stepping motion are studied.The(simulation) results show that the effects of payload mirror regular scanning motion and the solar(array) stepping motion on the satellite attitude are very small.But the satellite attitude is deeply(affected) by payload backbody calibration,so the compensation must be required,otherwise the pointing performance of payload mirrors can not meet the demands of satellite.