Abstract: There are obvious white exceptional bands in all 4 infrared (IR) full disk images of FY-2E, which have adverse effects on using images. By analyzing the time when exceptional band appears, the fact that bands in different IR images are in the same place, the matter in the white band, and the fact that the full disk images are all right after exceptional band, it's concluded that the satellite is all right but the moon's disturbing is the cause why exceptional band appears. Based on the FY-2E characteristics, it's identified that the process of moon leads to the white band in the image via direct-current restoration of FY-2E. Using satellite orbit parameters, the moon orbit and libration data, it can be confirmed the stochastic error in the circuit and libration are two important causes for the uncertainty in calculation. However, only 4 times are found during operation period from Mar 2012 to Jan 2013 though it seems to be 12 times according to the calculation. Both the analysis and the calculation are useful in practice for better using of FY-2E satellite.