With the development and promotion application of the trenchless horizontal directional drilling (HDD) technology, reflecting the deviation between the construction path and the design path became an important indicator of the quality. The paper introduced that the deviation between the construction path and the design path were drawn in the coordinate system, using the composite coordinates combining the Polar iso-distance net and Cartesian coordinate system. This method reflected the deviation between the construction path and the design path intuitively, and it had very intuitive and reliable significance for the acceptance.