Based on analysis of LZ77 compression algorithm this paper discusses the effect of input error codes to the decoding wordbook and decompression data and researches error code transmission issue .

分析了主流的LZ77算法编译码原理，讨论了输入误码对译码 字典和解压数据的影响，研究了误码传播问题。

FSAS could extract long-words and new-words from texts without wordbook .

本课题实现的频繁序列算法可以在无 字典情况下挖掘出文本中的频繁长词和新词。