The iron containing garnet has been examined by Fe-57 Mossbauer spectroscopy and vibrating sample magnetometer. The results show that the chromium in compounds of the Y3Fe5-xCrxO12 (x = 0.0, 0.25, 0.5, and 1.0) occupied at octahedral site, The substitution of Fe3+ by Cr3+ on the octahedral site results in much lowering of magnetic ordering temperature. The Mossbauer spectra can be analyses 3set or 4set of six Lorentzian with increasing an amount of Cr3+. It results from the distribution(C-4(n)) of Fe3+ and Cr3+ at octahedral site. The ratios of areas, a, di, d(2), d(3), in Y3Fe4.5Cr0.5O12 are 0.33, 0,22, 0.28, 0.14. The saturation magnetization and the coercivity decrease as increasing Cr3+.