Slag and fly ash are used in the fabrication of GC, and NaOH and Na2CO3 are used for slag and fly ash activation, then highly fluidized C30 Geopolymer Concrete (GC) is prepared. Φ100 mm SHPB apparatus is improved by using the pulse shaper technique, based on this, dynamic splitting-tensile tests are made, and the energy properties of GC under impact loading are analyzed. The results indicate that the incident pulse, reflected pulse, transmitted pulse energy and the energy absorption are increased with the rising of average incident pulse energy rate, but the increasing rate will gradually decay, the general law can be described as quadratic polynomial relationship. With the rising of average incident pulse energy rate, the damage level of specimen will be more serious and the comminuted area shaped like an triangle on the loading end will become larger, moreover, the comminuted area close to the incident bar is greater than that close to the reflected bar. GC and ordinary Portland cement concrete (OPCC) exhibit incident pulse energy rate dependency, but the increasing rate of energy absorption of OPCC almost keeps constant with the rising of average incident pulse energy rate, and the general law can be described as linear relationship.