Abstract: In view of the fact that the proportion of nondestructive testing for pipeline welding in various construction codes of oilfield capital construction project is different, which leads to the unclear proportion of nondestructive testing in construction. This paper summarizes the nondestructive testing for pipelines and pipelines under various pressures in Oilfield capital construction project by comparing and classifying the common construction codes, combining with the actual situation of construction site and talking with the design unit, and hence an appropriate detection ratio was proposed and it might be used for reference.