Abstract: The borehole inclination correction of geological exploration needs to master the reasonable borehole inclination correction and calculation method, and obtain the offset distance after the borehole is projected on the exploration line section, so as to draw the exploration line section. According to the angle between the stratum strike and the exploration line, this paper divides the hole inclination correction projection method into three cases. Based on the study of the relationship between the stratum and the three-dimensional space and trigonometric function of the borehole, the calculation formulas for different projection methods are unified respectively. Without judging the exploration line and hole inclination orientation, the deviation measurement data is directly used to bring into the formula calculation. Through the calculation and verification of the hole inclination data of previous exploration boreholes through Excel, it shows that the calculation formula is correct. When the occurrence of the local layer and the orientation of the exploration line are certain, the larger the top angle of the hole section, the deeper the borehole, and the greater the difference of the cumulative offset distance of the section caused by different projection methods.