Along with the economic development and further improvement of mineral resources development and utilization, geological exploration is developing toward to deep and complex strata, drilling construction is also developing toward to the directional holes and branch holes. Higher requests are put forward for drilling technology to realize more comprehensive understanding of geological conditions, and the control of drilling trajectory also should be more and more accurate. In this paper, the drilling trajectory monitoring and mapping are described in detail， the related concepts of drilling trajectory and the calculation methods of the relevant parameters are elaborated. By the study on the related functions of Excel spreadsheet, which is successfully applied in the drilling trajectory parameters calculation and analysis; based on the research, Slidworks three-dimensional graphic software is successfully applied in drilling trajectory monitoring and mapping. The methods have been verified the feasibility in the actual work case.