To　improve　the　resolution　and　signal-to-noise　ratio,　and　suppress　side　lobe　and　grating　lobe,　an　imaging　method　based　on　phase　difference　of　array　data　was　proposed.　The　piezoelectric　transducer　array　and　the　laser　array　were　combined　with　amplitude　imaging　and　sign　coherence　factor　imaging,　respectively,　to　detect　the　defects　in　the　aluminum　plate.The　continuous　wavelet　transform　was　used　to　process　the　wide-band　Lamb　wave　signal　with　a　low　time-domain　resolution,　which　can　obtain　a　narrow-band　signal　with　a　high　time-domain　resolution　at　a　given　frequency.　Finally,　frequency　extraction　signals　were　processed　by　combining　the　amplitude　imaging　technique　and　the　sign　coherence　factor　imaging　technique,　and　then　defect　imaging　was　realized　in　the　aluminum　plate.The　piezoelectric　transducer　array　imaging　results　and　laser　ultrasonic　array　imaging　results　were　compared.　By　making　full　use　of　the　advantages　of　non-contact,　point　focus　of　the　laser　ultrasonic　array,　the　artifacts　can　effectively　be　reduced　so　that　the　defects　can　be　located　more　accurately.　©　2018,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.