The exploration of major engineering construction in the west is faced with harsh environmental conditions such as “steep terrain， steep structure and fragile ecology”. The geological information that cannot be implemented and collected by vertical drilling is incomplete. Horizontal directional drilling and comprehensive testing technology are key technologies to solve the exploration problems of large and deep buried tunnels in major projects. However， there are difficulties in controlling the variable trajectories of steeply dipping formations， insufficient power for drilling machines in high cold and hypoxic formations， and high ecological and environmental requirements in ultra long horizontal rope coring drilling. This article introduces the development of a series of horizontal directional coring drilling equipment， a multi-parameter all-round wireless logging system， and horizontal rope drilling trajectory control technology and equipment， which have been successfully applied in the Sichuan Tibet Railway and the Water Diversion Project from Daduhe to Minjiang river， Play a demonstration and promotion role in the western plateau area.