The relativistic mean field theory is used to investigate the shape evolution of Pt isotopes. The calculated binding energy and deformation parameter/32 are consistent with those obtained in experiment. The potential energy surfaces and the single particle levels show the shape evolution for Pt isotopes. From N = 88 to N = 126, the shapes for Pt nuclei evolve from spherical shapes to X（5）, and then to shapes of stable quadruple deformation, finally back to the spherical shapes. In detail, 166-172^Pt are spherical. 174^pt and 192-196^pt possess the X（5） symmetry. 176-190^pt are deformed nuclei. 204^Pt holds spherical shape. These results in agreement with the experimental observations.%利用形变约束的相对论平均场理论研究了Pt同位素偶-偶核的形状演化，比较了基态结合能和四极形变的理论计算值和实验值，分析了这些核的位能曲线、单粒子能级及其随四极形变愚的变化规律，发现从N=88到N=126，Pt同位素的基态变形从球形对称核经X（5）对称性核、演化为具有稳定形变的核，再演化为球形核的变化过程．其中，176-190^Pt是近球形核，174^PT和192-196^Pt位于球形和稳定形变之间，可能具有X（5）对称性，176-190^Pt具有稳定的变形，198-202^Pt是近球形核，204^Pt是球形核，这些结果与实验一致．
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