We propose to perform a detailed comparison between infrared and X-ray high spatial resolution images on two selected bright X-ray regions in the Cygnus Loop supernova remnant (SNR). We will be able to determine down to which scale infrared and X-ray emission are linked, and to derive direct implications for the grain processing in the hot gas of SNRs. Correlation with the optical emission will also be carried out. The morphological differences between optical and X-ray emission will permit to decompose the infrared emission into two components : one arising from the collisionnaly heated dust in the hot gas and the other from dust heated within cooler optically emitting filaments. X-ray spectra with a good spectral resolution (ASCA satellite) strongly support a large underabundance of elements in the Cygnus Loop SNR. Depletion of the these elements from the gas phase is usually invoked. A map of the infrared silicate band, compared to the X-ray emission should clarify this point and show if the X-ray missing material is still in the grain phase. Images in the 10.7-12 microns range will show if the carriers of unidentified infrared features survive or not the passage of the shock and if they do, how they are linked to the optical and X-ray emission.