Abstract:After taking into consideration the reseach generator saturation, excitation system and the load of short circuit current decay effect, the simulation calculation of the short-circuit of Xishuangbanna grid is conducted． Results show that the generator saturation and excitation system has little effect on the short-circuit current decay, and the load has a greater impact on the shortcircuit current decay, especially dynamic load, which could be used as reference on study and assessment of the actual Xishuangbanna grid short-circuit decay．