采用磁悬浮区域熔炼的方法制备了ＴｉＡｌ合金ＰＳＴ晶体，然后在８００℃下对其压缩性能和变形组织分别进行了测试和观察。结果表明，在８００℃时的屈服强度取决于片层界面与压缩轴的夹角φ在φ＝９０°时屈服强度最高，而φ＝４５°时最低。８００℃时屈服强度较室温下的有较大程度下降，这与α２相中锥面滑移系｛１１２１｝＜１１２６＞的临界分切应力的降低有关． The TiAl alloy PST crystal was prepared by magnetic levitation method. The compressive properties and deformation microstructure were tested and observed at 800 ℃. The results show that the yield strength at 800 ℃ depends on that the angle φ between the interface of the lamella and the compression axis is the highest at φ = 90 ° and the lowest at φ = 45 °. At 800 ℃, the yield strength decreases to a great extent at room temperature, which is related to the decrease of the critical shear stress in the {1121} <1126> system of the conical slip system in α2 phase.