Abstract: In the drilling process, the motion state of drill is extremely complex. Suffering from long-standing tension, pressure, torque, vibration and centrifugal force, along with the corrosion time of drilling fluid, the damage of the drill is very serious. Through repeated usage, there are many defects will appear in the drill, such as fatigue injuries, crack, internal and external wall corrosion, pockmark, piercing, strain, and cut marks etc. If these defects were not promptly detected, failure in underground would possibly occur, resulting ingreat economic loss. The main reasons for failure of drill pipe was analyzed, and the several testing methods to detect drill pipe as a whole were also introduced. A summary of the principles, the advantages and disadvantages of final testing of the drill pipe was given.