Abstract: Earthquake disaster may cause serious damage to the infrastructure of electricity-gas systems, leading to power outage and gas outage accidents. To assess and improve the energy supply capacity of electricity-gas system under earthquake disaster, this paper first constructed the failure probability model of electricity-gas system components considering the uncertainty of earthquake spatial distribution and magnitude. Then, an optimal load shedding algorithm of electricity-gas system based on two-stage gas network optimization power flow model was proposed, which improves the convergence and calculation efficiency. On this basis, the resilience assessment and improvement method of electricity-gas system under earthquake was established. Finally, an electricity-gas test system was built on the basis of IEEE RTS 79 power grid and 14-node gas network, which is used to verify the proposed method. The results illustrate that the resilience assessment and improvement method of electricity-gas system proposed in this paper can help panners to judge the resilience level of the system under earthquake disaster, and can choose the best resilience promotion scheme in combination with economy.