Abstract: To overcome the limitation of the internal memory space and calculation complexity for the asymptotic image transmission algorithms, an improved algorithm, the static image coding method, is proposed. The algorithm carries out the high-frequency section subdivision of the wavelet coefficients after the wavelet transform, sets the thresholds for the image blocks of different frequency respectively, adopts a new discriminating criterion, and improves the framework of the algorithm. This concept is adopted in JPEG2000. The improved coding method is simulated with MATLAB 6.5. The result shows that the occupation of the internal memory space is reduced and the computational complexity is reduced, and the compression effect meets the expectation.