In　this　paper,　the　tests　under　biaxial　compression　were　conducted　on　five　kinds　of　recycled　aggregate　concrete　(RAC)　by　stress　ratios　(0:-1,　-0.1:-1,　-0.25:-1,　-0.5:-1,　-0.75:-1,　and　-1:-1)　at　the　strain　rates　of　10(-5)/s,　10(-4)/s,　10(-3)/s,　and　10(-2)/s.　This　study　was　accomplished　in　the　servo-hydraulic　multi-axial　testing　system,　which　was　carried　at　Dalian　University　of　Technology.　The　experimental　phenomena　of　RAC　under　biaxial　compression　are　described,　and　the　experimental　results　of　biaxial　compressive　strength　of　RAC　are　analyzed.　The　effects　of　strain　rate,　stress　ratio,　and　substitution　percentages　of　recycled　coarse　aggregate　(RCA)　on　the　biaxial　compressive　strength　of　RAC　were　studied.　During　the　experiments,　the　failure　modes　of　concrete　have　not　been　changed　because　of　the　increased　impact　of　the　RCA　on　RAC.　The　strength　of　RAC　is　improved　with　the　increase　in　strain　rates.　With　the　increase　in　stress　ratios,　the　biaxial　compressive　strength　increases　at　first.　However,　the　strength　then　decreases.　Based　on　the　strength　theory　of　common　concrete　and　analysis　of　experimental　data,　this　paper　built　a　new　dynamic　strength　criterion.　The　biaxial　compressive　strength　criterion　describes　the　characteristics　of　structural　RAC　at　different　stress　ratios　and　strain　rates.　This　strength　criterion　can　provide　theoretical　foundation　for　future　concrete　multi-axis　dynamic　tests　and　the　design　specification　with　the　considerations　of　multi-axis　dynamic　strength　and　nonlinear　analysis.　The　feature　of　the　model　is　that　it　can　take　into　account　the　influence　of　strain　rates.