Abstract: In the paper an effective image data lossless compression method is presented, which is mainly used for remote sensing image data transmitted via constant bit rate channel. The algorithm is composed of three parts, decorrelation preprocessor, adaptive entropy coder and output memory controlling. Decorrelation preprocessor comes from the theory of analyzing feature of local texture, the entropy coder is borrowed from lossless data compression recommendation given by the Consultative Committee for System (CCSDS), and the memory controlling is decided by actual condition of input and output channel. These problems of transmission error propagation and controlling of compressed data output buffer are all resolved effectively in the scheme.