This　paper　presents　the　application　of　ultrasonic　guided　waves　to　the　detection　and　imaging　of　discontinuities　by　using　a　distributed　sparse　transducer　array　in　a　quasi-isotropic　composite　plate.　Considering　the　anisotropic　property　of　composite　plates,　a　group　velocity　polar　profile　of　the　S-0　mode　at　200　kHz　in　different　azimuthal　directions　in　the　plate　was　first　measured　by　experimental　techniques　and　achieved　good　agreement　with　theoretical　predictions.　The　2D　visualization　of　single　and　double　simulated　discontinuity　locations　in　the　composite　plate　can　be　achieved　by　the　combination　of　ultrasonic　guided　wave　technology　and　a　discrete　ellipse　imaging　algorithm.　Furthermore,　three　types　of　algorithms,　namely　full　summation,　full　multiplication,　and　summation　and　multiplication　combination,　were　employed　to　reconstruct　the　discontinuity　location.　The　results　show　that　summation　and　multiplication　combination　can　enhance　the　image　fusion　ability　of　discontinuity　information　in　the　composite　plate　compared　with　the　other　two　algorithms.　Therefore,　this　ultrasonic　guided　wave　technique　based　on　the　discrete　ellipse　imaging　fusion　approach　can　be　effectively　used　for　accurate　discontinuity　detection　and　imaging　of　anisotropic　composite　plate　structure.