In this paper,corresponding to the image fusion algorithms of IHS,HPF,DWT and other typical  remote sensing image fusion algorithms,the data parallel algorithms such as PIHS,PHPF,PDWT are proposed. Based on the algorithm complexity analysis of spacetime,the communication and I/O optimization are carried out. The IKONOS satellite images tested on a cluster system  show that our proposed parallel algorithm can obtain good parallel speedup and high parallel efficiency. These three algoriths are suitable for realtime remote sensing applications.