a novel method for real-time estimation of the junction temperature using on-state Vce-on is proposed in this paper. The dependence of temperature on the Vce-on in IGBT module is analyzed firstly, and the parameters of the interconnection materials are extracted using simulation software, which greatly reduces the experimental cost and the operation is easier. Most importantly, the influence of interconnection material resistance on IGBT module is fully taken into account , and compensation is given. Finally, this paper proves the validity of the method by comparing the measurement results by infrared camera with the estimation results by proposed method.