The　design　of　the　buckling　configuration　for　a　rolling　soft　robot　has　a　significant　effect　on　its　rolling　performance,　but　a　thorough　analysis　remains　lacking　for　many　soft　robot　buckling　configurations　because　of　the　difficulty　of　analyzing　the　buckling　problem.　This　work　comprehensively　analyzes　the　static　buckling　morphology　of　two　nested　elastic　rings　under　gravity　based　on　a　theoretical　model　using　the　minimum　potential　energy　principle.　Two　nested　rings　present　a　tank-track-like　buckling　morphology　under　gravity,　which　depends　on　the　length　ratio,　the　bending　stiffness　ratio,　and　the　gravity　ratio　of　the　inner　ring　to　the　outer　ring.　Increases　in　these　three　ratios　lead　to　a　lower　tank-track-like　buckling　structure　with　an　increased　ground　contact　length　and　a　reduced　gravity　moment　on　the　slope.　The　tank-track-like　buckling　structures　predicted　using　the　theory　agree　well　with　Finite　Element　Method　(FEM)　simulations　and　experimental　results.　This　work　provides　design　guidance　on　achieving　the　maximum　slope　stability　and　the　required　robot　configuration　by　tuning　the　geometrical　and　material　parameters　of　rolling　soft　robots.