Abstract: Among oil well drilling equipment and tooling,the high-strength drill pipe plays a very critical role.Based on the results of sample analysis and tests of S135 and G105 drill pipes made both at home and abroad for their physical quality evaluation,and making reference of relevant domestic and foreign technical literatures,a comprehensive comment on drill pipes made both at home and abroad is given,addressing such aspects as material selection,mechanical properties,geometry,structural characteristics as well as limiting loading capacity of the pipe as a whole.