Based　on　the　code　of　GB/T　19624-2004　＂Safety　Assessment　for　In-service　Pressure　Vessels　Containing　Defects＂　and　taken　the　shapes　of　pressure　vessel　into　consideration,　a　characterization　method　on　the　burial　defect　in　the　pressure　vessel　with　curvature　surface　is　presented.　It　also　provides　accuracy　analysis　of　the　proposed　method,　the　simulation　results　shows　that　it　is　a　more　realistic　way　to　use　arc　coordinate　system　to　characterize　burial　defects　in　pressure　vessels.　A　new　numerical　simulation　method　is　presented　for　analysis　the　pressure　vessels　containing　burial　defects.