Beijing-1 microsatellite is an applied earth observing microsatellite of China.It combines SSTL’s standard Disaster Monitoring Constellation（DMC） multispectral camera with a high resolution panchromatic imager.To enlarge its swath and shorten the revisiting time

every multispectral band is combined by two part images which were captured by two separate cameras.This design must add the error of the band registration.To assess Beijing-1 microsatellite

this paper introduces an effective method to evaluate the band registration accuracy.The method is based on cross-correlation of image digital number.Based on the result of band registration

this paper presents a new method to assess the images’ distortion and its coherence of three bands.