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Based on the mechanical performance testing ,the failure assessment to X80 pipeline steel welded joint with crack defect was studied by adopting BS 7910-2005 standard of British Standards Institution under two kinds of different welding process.The results showed that in secondary assessment for the same weld .,due to 2B assessment adopted true stress-true strain data ,so if reflects the anti-fracture ability of material better than 2A assessment .For the surface crack and hidden crack with the same size,the danger of surface crack is greater than that of hidden crack ;the hidden crack ,whose location in welded joint can affect assessment result,is closer to the surface,the more dangerous will be .In case of a 3.2X1 mm crack exists in circumferential weld joint ,all assessment points are in the range of acceptance assessment curve ,it proves the structure of welded joints is safety .