This　paper　discusses　a　hardware　accelerated　implementation　for　PNG　image　decoding　within　LZ77　and　Huffman　compression　algorithm　without　any　distortion,　while　compare　with　software　decoding,　parallel　processing　is　the　most　significant　feature　of　high　efficiency.　This　design　utilize　cooperating　of　software　and　hardware　to　solve　the　problem　of　controlling　hardware　decoder,　extend　Deflate　algorithm　of　Huffman　tree　to　achieve　fast　look　up,　so　it　can　improve　decode　efficiency　with　lower　power　consume.　©　2008　IEEE.