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The aircraft at high-speed movement in its flight process will undergo complex space environment, and suffered a serious challenge on electrostatic resistant property. Aiming at some silicon-based composites, we analyzed the assessment methods of electrostatic resistant property to determine static decay time as the key assessment parameter, and researched the static decay time of the silicon-based composites, obtained the fading characteristic before and after ablation, which will provides an important basis for the static security of high-speed aircraft. The results shows that: Silicon-based composites before ablation has a long static decay time and a large residual charge; the static decay time and the residual charge of silicon-based composites after ablation are significantly reduced, which greatly benefit the electrostatic resistant property.