The invention discloses a linear superimposed heat conduction method considering boundary effects. The method includes the following steps that a representative heat generating unit is firstly selected, then in the unit impulse load condition, temperature rise data of all temperature calculation nodes under the action of the representative heat generating unit is subjected to analog calculation, finally, according to the number of actual heat generating units, corresponding actual load spectrums of all the actual heat generating units, and the temperature rise data obtained by the analog calculation, the temperature rise data of all the nodes under the action of all the actual heat generating units is subjected to accumulative summarizing, therefore linear superimposed calculation is achieved, and temperature calculation in heat transfer problems is solved. Due to the adoption of the linear superimposed calculation method, a large amount of finite element calculation time can be saved. Particularly, when time required for the analog becomes longer, the efficient characteristics of the method are more obvious.