The horizontal directional intersection (HDI) technology effectively solves the problems that the long-distance crossing and the gravel stratum crossing can't be realized by the traditional horizontal directional drilling (HDD). This paper introduced the horizontal directional intersection technology and its application both at home and abroad, analyzed the crossing intersection guidance technology that was based on triaxial accelerometers and triaxial reluctance sensor in great detail; and intersection model was established based on the magnetic field generated from an axial magnet.