Abstract: Based on the behaviour of reinforced concrete structure exposed to fire and a given (e.g. ISO) temperature-time curve, the tempersture field of a reinforced concrete structure is considered as a non-linear transient thermal transfer Problem. and a calculation method of 2-D finite element analysis is presented under reasonable simplification. Corresponding computer program is compiled and implemented. The theoretical temperature field of the reinforced concrete member is presented and compared with experimental results. It is found that the calculation method is simple, reliable, accurate and amble. It is applicable to the analysis and calculation of temperature field of reinforced concrete structure.