In　order　to　be　able　to　suppress　direct　wave　of　TOFD　(time　of　flight　diffraction)　D　scanning　image,　a　new　method　was　introduced.　In　order　to　remove　noise,　firstly　the　TOFD　D　scanning　image　was　decomposed　into　a　series　of　one-dimensional　signals.　Then　wavelet　denoising　was　used　to　remove　noise　of　one-dimensional　signal.　Finally,　with　a　series　of　processed　signals　a　new　image　was　reconstructed.　The　effect　of　parameters　on　the　filtering　results　would　be　discussed　for　the　comparison　of　RLS　(recursive　least　square)　adaptive　filtering　algorithm　and　variable　step-size　LMS　(least　mean　square)　adaptive　filtering　algorithm,　and　variable　step-size　LMS　adaptive　filtering　algorithm　would　be　used.　Moreover,　an　improved　algorithm　was　introduced　to　suppress　direct　wave　of　a　non-near　surface　defect　image.　The　result　demonstrated　that　the　algorithm　was　available.