The State Council's guidance on promoting the construction of urban underground comprehensive pipe corridors has promoted the construction of a comprehensive information system for underground pipelines, important infrastructure for urban operation. Building a complete urban underground pipeline system, so that the underground pipeline construction and management level can adapt to the needs of economic and social development, and greatly improving emergency and disaster prevention capabilities is an urgent task facing smart cities and urban management "Internet +". Establishing a comprehensive pipeline management information system with basic information such as the scale, location relationship, property rights ownership, and operating life of underground pipelines has many key issues to be solved. Measuring and determining the location and location relationship of underground pipelines is one of the important issues. Based on the characteristics of concealed engineering and non-metallization of underground pipelines, the project studies "fiber-optic gyroscope-based spatial positioning measurement technology for underground pipelines", and applies a fiber-optic gyroscope-based positioning system to determine the spatial position of underground pipelines through fixed-point measurement into the interior of the pipeline. Geodetic coordinates or relative coordinates of the position, and obtains data on the spatial position and positional relationship of underground pipelines; studies the construction of a fiber-optic gyroscope-based underground pipeline spatial positioning system; Establish a fiber-optic gyroscope solution method and a geographical coordinate calculation method based on three-dimensional space transformation; establish an algorithm for correcting non-orthogonal and non-coincident three-dimensional coordinate axes through optimization techniques such as variable rotation method, simplex method, and dynamic planning; Form a new technology for positioning and measuring underground pipelines in space. Based on the needs of urban development, the project solves key issues in the construction of an integrated information system for underground pipelines for smart cities and urban management "Internet +". It has good practical significance and social and economic benefits.