Abstract: As-cast Mg-6Gd-3Y-1Zn-0.5Zr alloy was homogenization annealed at 510 ℃ for different holding time, and then rolled at 450 ℃ with 1-5 passes. The effects of homogenization annealing time and rolling passes on microstructure and tensile properties of the alloy were investigated. The results show that, comparison with the alloy being annealed for 12 h, the amount of lamellar LPSO phase in the alloy being annealed for 40 h was more, which leads to its strength and ductility were far less than those of the alloy being annealed for 12 h. With the increase of rolling passes, the volume fraction of recrystallized grains increased, accompanied by the improvement of strength and ductility. After being rolled at 450 ℃ for 5 passes, the alloy being annealed for 40 h exhibited the best tensile properties, with yield strength of 271 MPa, tensile strength of 340 MPa and elongation of 9.0%.