The invention discloses a method and 
system of 
closed loop assessment for 
pipe body defects of a long-distance oil and 
gas pipeline, and relates to the technical field of pipeline systems. The assessment method comprises the following steps: 1) beginning; 2) recognizing and assessing the 
pipe body defects; 3) examining and verifying; 4) if the examination and 
verification are not pass, returning to recognize and assess the 
pipe body defects, and if the examination and 
verification pass, moving to a 
database firstly and then conducting defect repairing; 5) examining and verifying; 6) if the examination and 
verification are not pass, returning to defect repairing, and if the examination and verification pass, moving to the 
database firstly and conducting item-removing assessment; 7) finishing. According to the invention, a 
closed loop monitoring of defect recognizing and assessing, defect repairing and defect item-removing assessment for a pipe body can be achieved, the operation process of the defect 
closed loop assessment is simplified, related 
service information is integrated, accurate and reliable data support is provided for service management and decision, and defect item removing effect is effectively assessed.