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Explosion threat has a devastating impact on buildings, warships, vehicles and human lives, which puts forward urgent requirements for the development of explosion protection systems. In this study, a sandwich protection system against close-range blast loads containing graded re-entrant circular (REC) auxetic core was proposed, and its blast-resistance performance was investigated based on the numerical methods validated by the field blast test results in the literature. Numerical results showed that compared with the conventional re-entrant (RE) core with the same mass, the REC core can reduce the maximum displacement (MaxD) of the back panel by 2.2% and increase the energy absorption (EA) of the system by 5.7%. If the two cores share the same cell wall thickness, the REC core can reduce MaxD by 28.0% and increase EA by 2.1%. In addition, the effects of geometric parameters, thickness parameters and gradient parameters on the blast-resistance of REC cored protection system were exami ....