Abstract: The well-drilling operation conditions in Tarim Oil Field are so harsh that drill pipes are under complicated loads,and thus apt to fail to operation.Failure causes of the said drill pipes are investigated,and relevant preventative actions and their effectiveness are elaborated.It is regarded that the prevailing drill pipe standard can be no longer satisfactory to the application requirements for drill pipes as used in Tarim Oil Field.Years' operation practices of the oil field have proven that drill pipe failure rate has been significantly reduced,and drill pipe service life prolonged,due to the supplementary technical terms for ordering,and the stringent site NDT specification as established by Tarim Oil Field.