Mg_96.5Gd_2.5Zn₁、Mg₉₆Gd_2.5Zn₁Ca_0.5和Mg₉₅Gd_2.5Zn₁Ca_0.5Al₁ alloys were fabricated by conventional gravity casting. The influence of Ca and Al elements on the formation of LPSO phase in as-cast Mg-Gd-Zn alloys and the microstructural evolution and the variation in mechanical properties through subsequent solid-solution heat treatment and hot extrusion processing were investigated and the correlation between the microstructural transformation and mechanical behavior was analyzed.