MnFePGe compound has drawn tremendous attention due to its good potential as an alternative to vapor-compression techniques around room temperature. In this article, Mn1.2Fe0.8P0.76Ge0.24 compound was prepared by mechanical milling and subsequent spark plasma sintering (SPS) technique, its microstructure was investigated by SEM, meanwhile the relationship between its phase transition and the properties was investigated by Neutron diffraction, SQUID, DSC and XRD. The results show that the microstructure of Mn1.2Fe0.8P0.76Ge0.24 compound is compact, and the compound possess a hexagonal Fe2P-type crystal structure. Applied magnetic field or temperature change can induce the transformation between paramagnetic phase and ferromagnetic phase. When the applied magnetic field increased or temperature reduced, paramagnetic phase transformed to ferromagnetic phase and caused the magnetic entropy change becoming larger. Research shows that the magnetic entropy change of Mn1.2Fe0.8P0.76 Ge0.24 compound is directly corresponding to the percentage of the phase transition.