Abstract: Dynamic behavior of 30 Reactive Powder Concrete-Filled Steel Tube (RPC-FST) specimens after exposure to high temperature under different impact loading is investigated by using φ74 mm-Split Hopkinson Pressure Bar (SHPB). Dynamic stress-strain relationships and failure modes for RPC-FST after exposure to high temperature are derived experimentally, and then a prediction method for peak stress or peak strain of RPC-FST specimens is presented. Results show that obvious strain rate effects can be observed in RPC-FST specimens under impact loading, and RPC-FST still remain remarkable compressive strength, good ductility and integrity after exposure to high temperature. The steel ratios have great influences on the dynamic behavior of RPC-FST, either initial elastic stiffness or peak stress is significantly increased as steel ratio increased. The analytical results are in good agreement with experimental data, which means that the dynamic peak stress or peak strain of RPC-FST after exposure to high temperature can be estimated accurately.