Ni2MnGa alloys with relative density of 99.6% were obtained with a maximum pressure of 80 MPa and a maximum temperature of 1173 K applied in the Spark Plasma Sintering (SPS) process. Heat treatment was subsequently performed at 1073 K for 864 ks in vacuum with slow cooling. The martensitic transformation temperatures, Ms, Mf, As, Af, were determined as 235, 220, 239 and 254 K respectively. Mechanical property comparisons of sintered alloys to arc-melted alloys were experimentally investigated by compression tests at room temperature. Sintered alloys show compressive ductility of 24% strain with transgranular cracking while arc-melted alloys only have 8% strain and both intergranular cracking and transgranular cracking. Furthermore, the sintered alloys possess higher yield stress and fracture strength.