In the field of pile foundation， with ever demanding quality control requirements for the bearing capacity of pile foundation and the verticality of pile hole in infrastructure construction， the existing conventional pile foundation hole boring monitoring technology cannot meet the requirements； it is also true with drilling of deep wells， ultra deep wells， scientific exploration wells and horizontal wells due to the deviation of the actual drilling trajectory from the design trajectory caused by formation factors and drilling processes. As a result， deviation monitoring becomes more and more strict， and the existing instruments cannot meet the requirements for high-precision drilling trajectory measurement. In view of the above problems， this paper sorts out the development status of inclination measurement-while-drilling technology， and in reference to the characteristics of geological core drilling and rotary pile hole drilling technology， puts forward a high-precision real-time monitoring scheme for the wire-line coring drilling trajectory and for the verticality of large-diameter and long bored pile holes. The promotion of this scheme will positively guide the construction operation and ensure the overall quality of the drilling / pile hole.