The　computer　evaluation　of　weld　X-ray　film　is　an　attractive　technique　for　weld　seam　NDT　(nondestructive　testing).　To　achieve　this　target,　digitalization　of　film　is　the　first　step　and　automatic　defect　identification　is　another　key　technique.In　this　paper,　a　weld　X-ray　film　digitalizing　system　has　been　established　with　linear　array　CCD　and　highlight　LED　light　source.　Its　space　resolution　can　reach　0.04　mm/pixel　and　scanning　speed　can　reach　100　mm/s　for　an　industrial　film.　The　transfer　function　curves　of　the　system　have　been　measured　and　the　results　indicate　that　its　image　gray　resolution　can　reach　88　G/D　at　4.5D,　and　its　dynamic　range　can　be　wider　than　2.0D.　In　order　to　facilitate　the　evaluation　of　large　welded　structure,　a　panoramic　evaluation　algorithm　is　developed　also.　The　algorithm　includes　image　matching,　image　fusion　and　panoramic　evaluation　of　the　long　linked　film　image.　©　2011　Editorial　Board　of　CHINA　WELDING.