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The effect of yttrium on the microstructure and properties of Ti-5.5Al-3.5Sn-3.0Zr-1Nb-0.3Mo-0.3Si (IMI 829) and Ti-14Al-21Nb high temperature alloys was studied by using optical microscope, SEM and mechanical property testing devices. The results show that the microstructure and grains of the two alloys can be fined by adding yttrium. For IMI829-0.2Y alloy, the favorable mechanical properties at room temperature and creep properties at 550℃ are obtained, and the high temperature mechanical properties of Ti-14Al-21Nb-0.1Y alloy are improved as well.