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All the samples of Gd5Ge2(Si2-xAlx(x = 0, 0.1, 0.2, 0.5) were produced by arc melting under argon atmosphere. The crystal structures of all samples crystallized in the orthorhombic structure are studied by X-ray powder diffraction (XRD). The crystal symmetry is preserved while the content of Al changes. By Lakeshore VSM, we have measured M-T curves and M-H curves of the samples at different temperatures. The result shows that the magnetocaloric effect of Gd2Ge2(Si2-xAlx) is the largest one in all samples at their Curie temperatures, which is 1.4J Kg-1 · K-1 where x=0.2. The magnetic-entropy changes are small before and after annealing, which indicated that the uniform magnetocaloric effect phase had been formed before annealing.