The addition of proper amount of calcium to magnesium alloys can refine grain size, enhance strength and heat-resistant. The influence of different contents of calcium (Ca) on the grain size, texture and mechanical properties of Mg-2Al-xCa-0.2Gd (x=0.2, 0.5, 1.0, 2.0; mass%) were investigated in this paper through the OM, SEM，EBSD and XRD techniques. The results showed that with the increase of the Ca content the grain size gradually decreased which leads to the improvement of strength. However, the texture evolution had different characterization such as the decrease of {0001}<11 0> texture, the firstly increase and then decrease of the pyramidal texture components containing the <11 3> direction, which resulted in the corresponding change of elongation and Erichsen value. The magnesium alloy with 0.5% calcium content exhibited bimodal texture characterization and showed the best mechanical properties with the maximal tensile strength of 238MPa, the total elongation of 22% and the Erichsen value of 4.31mm.