Non-contact　air-coupled　ultrasonic　transducers　were　used　to　generate　pure　Lamb　wave　mode　in　quasi-isotropic　composite　plate,　the　wave　mode　was　used　to　scan　for　delamination　inspection.　In　the　scanning　process,　generating　and　receiving　transducers　were　arranged　on　the　same　side　of　the　plate　oppositely　and　obliquely.　They　were　linearly　moved　synchronously　in　two　orthogonal　directions　in　order　to　obtain　different　inspection　signals　at　different　positions.　Wavelet　coefficient　envelope　signals　at　certain　generating　frequency　were　extracted　from　the　inspection　signals　in　different　scanning　paths　through　continuous　wavelet　transform　to　image　the　delamination　defects.　Based　on　this,　damage　index　was　defined　by　using　probabilistic　damage　algorithm　and　damage　index　of　different　directions　were　combined　to　realize　the　delamination　imaging.　Data　fusion　of　imaging　results　acquired　from　two　orthogonal　directions　was　achieved　by　using　full　summation　algorithm　and　full　multiplication　algorithm.　The　delamination　defect　can　be　well　located　and　reconstructed.　Furthermore,　a　threshold　was　introduced　to　the　imaging　algorithm　to　improve　the　location　precision　and　reconstruction　quality　of　the　delamination　defect.　©,　2015,　Beijing　University　of　Aeronautics　and　Astronautics　(BUAA).　All　right　reserved.