Ti-47.5Al-6.8 Nb-0.2W-xY (x=0,0.1,0.2 at.%) alloys were prepared by high - energy ball milling and spark plasma sintering processes, and the effects of Y microalloying on the high temperature compression creep properties of Ti-47.5Al-6.8 Nb-0.2W alloys were investigated by SEM, EBSD and TEM. Creep experiments were carried out at 800~850 ℃, with a stress of 250 MPa and a time of 50 h. The results show that the Ti-47.5Al-6.8Nb-0.2W-xY alloys are all composed of equiaxial γ grains, γ grain boundaries of the bulk α₂ and B2 phases, α₂/γ lamellar colonies .The added Y is mainly in the form of Al₂Y particles at the grain boundaries to form a chain structure, Y can refine the grains and increase the α₂/γ lamellar colonies, when the Y content was increased from 0 to 0.2, the grain size was reduced from 12.1 μm to 7.8 μm, with the most significant refining effect. After creep in the alloy γ grains slightly flattened, lamellar bending and degradation phenomenon, lamellar clusters within the appearance of a large number of fine recrystallised grains and spherical B2 phase, creep temperature increases to promote the formation of dynamic recrystallisation. The addition of Y significantly improves the compressive creep properties of the alloy. At 800 ℃, the maximum creep strain of the 0.2Y alloy is 8.96%, and the minimum creep rate is 4.01×10_-7 ^s_-1, which is reduced by 48.88% and 62.09%, respectively, compared with that of the alloy without Y. The improvement in the mechanical properties of the alloys was attributed to the precipitation strengthening of the second phase Al₂Y particles, lamellar refinement and reduction of the B2 phase.