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进行了SrTiO3_CaTiO3系统的X_射线衍射分析，结果表明，当Ca2+置换Sr2+而形成ABO3钙钛矿型固溶体时，相对衍射强度(I/I1)100减弱.通过测定晶体结构的晶胞参数，进而比较衍射强度理论值及实测值，可以证明(I/I1)100的减弱与ABO3钙钛矿型结构中A位离子的原子散射因子有关，由于钙的原子散射因子小于锶的原子散射因子，导致(Sr，Ca)TiO3固溶体的相对衍射强度(I/I1)100减弱.另外，通过比较衍射强度I110/I111的实测值与计算值，还获得了A位离子的占位情况.研究结果为SrTiO3基陶瓷材料的微量物相鉴定及微观结构分析提供了依据.“,”The XRD (X_Ray Diffraction) analysis of SrTiO3_CaTiO3 system was carried on, the results showed that a solid solution with the ABO3 perovskite type structure was formed when Ca2+ replaced Sr2+ ions, and the relative intensity of the X_ray diffraction (I/I1)100 decreased. The cause of which was found by the comparison between theoretical and measured diffraction intensities by determining the lattice parameter of sample structures. The change of (I/I1)100 depends on the atomic scattering factor of ions in Site A in the structure. The (I/I1)100 decreases in (Sr,Ca)TiO3 solid solution because the atomic scattering factor of calcium is less than that of strontium. The space occupancy of ions in Site A can be obtained by comparing the intensity I110/I111 measured and calculated. This approachprovides the basis for the microscale phase identification and microstructure analysis of ceramic mate_rials based on SrTiO3.