In order to find a method that not only can reflect the cable’s actual situation turely but also can caculate the cable temperature field simply and rapidly

a new method named heat charge simulation method was proposed to calculate the steady temperature field of underground heat pipe according to the comparability of electric field and temperature filed.Based on the equivalent quantity of heat exchange

the coefficient of air convection was replaced by the equivalent depth of soil.The simulated heat charge was substituted for the loss in heat pipe core and for the effect of air on soil temperature field.The constraint isothermal equations were established via mirror method.The Gaussian method was used to solve the equations and calculate the steady temperature field of underground heat pipe.The trial and finite element method（FEM） simulation proves that the heat charge simulation method is effective to calculate the steady temperature field of underground heat pipe.