Abstract: When the air directional drilling technology is used for drilling construction, whether the screw motor can be well lubricated is a key factor affecting its life. This paper introduces two kinds of key equipment supporting the hole-outside lubrication technology, and details their working principles. Combined with the use of the equipment, the shortcomings of the hole-outside lubrication technology are analyzed. The bottom-hole lubrication technology of the screw motor is proposed pertinently, and the advantages of the technology are analyzed. A special bottom-hole lubricating drill rod for air screw motor is developed, which can be installed at the front end of the screw motor. The lubrication distance is no longer affected by the drilling depth, which improves the lubrication effect and reduces the waste of lubricating oil.