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The Sichuan-Tibet Railway from west to east passes through three geotectonic units including the Lhasa-Himalayan activity zone, Qamdo-Sanjiang orogeny and Sichuan basin. The study of the genetic mechanism of geothermal resources along the Sichuan-Tibet Railway is of great theoretical and practical significance for the understanding of its distribution and the development of geothermal fields among the land-land collision geothermal domain. On the basis of previous results, the differences between the heat source, reservoir structure and water transport mode of the geothermal fields along the Sichuan-Tibet Railway are discussed considering of the influence of regional structural evolution and structural deformation on the causes of them. According to the extrusion deformation strength, the geothermal domain along the Sichuan-Tibet Railway is divided into three geothermal belts by the Nujiang fault and the Longmenshan fault from west to east. The three geothermal belts are the collision-orogeny type of plate edge, the thrust type of interpolate and the stable depression type of inter basin, and develop 3 types of geothermal fields respectively, namely, the magma-rock type of high temperature, the fracture deep-cycle type of medium-low temperature, and the depression-basin type of low temperature. The terrestrial heat flow values of the three geothermal belts is gradually reduced from west to east (i.e. from 138.2 mW/m2 to 71 mW/m2, then to 51 mW/m2); their structural models of reservoir are respectively the extended grabens, the pup-up structures, the flower structures and the hidden anticlines, and the layer of thermal reservoir is gradually older and deeper (i.e. from Q+J-T3 toT2-3 then to T1-2). Although all kinds of geothermal fields have the same source of water (mainly from atmospheric precipitation), basically similar hydrochemical types (mainly Cl-Na type, HCO3-Na type) and mineralization degree (2 500- 3 500 mg/L), they have completely different geothermal water transport modes, especially in water circulation depth, contribution of shell source fluid, vertical/horizontal runoff path, etc. In terms of the differences in the resource endowment of different types of geothermal fields, it is suggested that the main ways of geothermal development along the Sichuan-Tibet Railway are high-temperature power generation, heating and cooling in Nyingchi-Lhasa section, medium-and low-temperature power generation, heating and cooling in Ya'an-Nyingchi section, and low-temperature heating and hot-spring-bath in Chengdu-Ya' an section.
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