Abstract: For heavy-caliber drilling axis of mud filled whether to achieve the design requirements, which needs to carry on the examination of the drill hole axis's verticality. However, the commonly used plumb bob ocular estimate estimation by eyes and the axis-line are the long-base method, which can not examine the drilling axis accurately whether to displace. Based on the barrel body test in the uniform application, makes the improvement to the traditional method. Use of the steel pipe isolation, the man-made space, and using principle that light to go straight, the vertical focusing which manufactured "photo source stauroscope examination appliance" that the synchronized distortion barrel body, in the tube shines, the mirror obviously point of intersection, metering equipment as drill hole spool thread central point. The experimental tests prove that the examination appliance satisfies the design requirements, thus examination question that the heavy-caliber drill hole filled with mud spool thread whether to displace is solved.