Research conclusions(1)In the geologic investigation of Lhasa-Rikaze railway, the key technology of ground temperature test mainly includes: sensor for ground-temperature measuring, drilling- hole，the hole structure，test time and data processing. (2)It is suitable that the thermostat was choose as the sensor for ground-temperature test, with high precision，simple operation，well repeated use.(3)Pay attention to the hole deviation control in the process of drilling. Put the temperature tube in the drilling-hole , so that the temperature measuring cable can be repeated used. The temperature test time should be 30 days after the drilling. ( 4 ) The data processing about ground temperature mainly includes: determining depth of constant temperature layer, calculating the ground heat flux，forecasting the tunnel temperature，etc. ( 5)The results of this study can provide the basis and reference for geothermal ground temperature measuring of similar region, have certain reference significance to the geothermal investigation and geothermal research.