Thermal physical properties of the soil and rock mass have become an important research branch in the field of geotechnical engineering.The key measuring method is laboratory thermal conductivity test.Applying the principles of steady method

this paper measures the thermal conductivities of the compact remolded samples of Xiashu loess in Nanjing

with the instrument of HC-110 thermal conductivity meter（EKO Inc.

Japan）.The factors that have influences on thermal conductivity are analyzed

including soil density

water content and temperature.The analysis of the mechanism of the experimental results and the influence of different physical parameters are made on the basis of the contact modes among soil matrix

and among soil particles and water molecules.It is concluded that under a certain water content

the higher the sample density

the bigger the contact area between soil and the stronger soil heat exchange capacity is

and an increasing value of thermal conductivity will be caused.In contrast

under a constant sample density

the reactivity of water molecules rises and the thermal conductivity improves as the temperature increases.When the water content is higher than 16.6%

the thermal conductivity has a plateau-like variation with the temperature change.When the temperature is higher than 50℃

the thermal conductivity has a smaller tendency.Under a certain temperature

the thermal conductivity increases significantly when the water content is less than 20%

and the variation of the thermal conductivity has a less range and presents a curve coincidence phenomenon when the water content is higher than 20%.