Abstract: After the studying of image wavelet decomposing coefficients and SPIHT algorithm,a wavelet image coding algorithm is introduced based on SPIHT,which aims at solving the(redundance) problem existing in three link tables coding of SPIHT even processed by same mode.The algorithm adopt different coding mode according to different coefficients range in three link(table) LIP、LIS and LSP.When threshold value decrease,the number of significant coefficients with same quantization level increase greatly in four domain,the absolute values of coefficients are close to each other,so only the averages of these significant coefficients are saved in coding process.The experiment results of the algorithm are compared with SPIHT algorithm,and show that the(algorithm) is excelled in PSNR and bpp.