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The equation of one-dimensional thermal conduction and convection in soil is solved analytically by applying the traditional harmonic method (HM) and the Laplace transform method (LTM). A simple method to determine accurate values of soil heat diffusivity and liquid water flux density is given. Using this method, we determined the soil thermal diffusivity, k= 0.85× 10− 6 m 2 s− 1, and liquid water flux density, W= 4.3× 10− 6 m 3 s− 1 m− 2, for the Naqu site in the summer of 1998. An experimental evaluation of the proposed methods is also given.