Huffman编码的主导思想是根据数据符号发生的概率进行编码。在源数据中出现概率越高的符号，相应的码长越短；出现概率越小的符号，其码长越长，从而达到用尽可能少的码符号表示源数据。Huffman编码方法是接近压缩比上限的一种最佳的编码方法。-The dominant idea of the Huffman coding is based on the probability of occurrence of data symbols for encoding.The higher the probability that the symbol appears in the source data and the corresponding code length is shorter　smaller probability symbols, the code length is longer, so as to achieve as little as possible code symbols indicates that the source data. Huffman encoding method is close to the compression than the upper limit of an optimal encoding method.reduce the temporal redundancy, DCT technology to reduce the the image spatial redundancy, the use of entropy coding aspects reduce the informationa statistical redundancy. The integrated use of several techniques, which greatly enhanced the compression performance.