With the temperature logging at the Yangbajing shallow thermal field as an example, this paper analyses the temperature characteristics of the thermal field both in plan and in profile and investigates geological and hydrological implications of the temperature field of this thermal field in this region. It is also pointed out that the study of various shapes of temperature logging curves contributes to analysing geological structures and tracing the migration of thermal bodies and the route of run-off, and thus provides scientific grounds for reasonable arrangement of drilling.