Abstract: To achieve quantitative improvement of the resilience of the electricity-gas interconnection system, this paper proposes a resilience improvement method based on global sensitivity analysis. First, the impact-increment-based global sensitivity is derived for quantitatively analyzing the joint impact of simultaneous changes in component failure probability parameters on the resilience index. Then, the global sensitivity is introduced into the optimization model of the component enhancement scheme in the scenarios of the budget limitation and the resilience qualified constraint, so as to design a cost-effective resilience enhancement scheme.Finally, the effectiveness of the proposed method is verified by taking an electricity-gas interconnection system in an earthquake disaster scenario as an example.