To reveal the thermodynamic mechanical behavior of vanadium-titanium pellets under the condition of low- carbon ironmaking with high high-proportion pellets,in the study of this paper,the effects of temperature,atmosphere,and reduction time on the thermal compressive strength of vanadium-titanium pellets were systematically investigated. A thermal strength tester combined with X-ray diffraction（XRD) and optical microscopy,the strength evolution was used to analyze the phase transformations,and microstructural changes of the pellet under different conditions. The results showed that at the inert N₂ atmosphere,the compressive strength of the pelets initially increased and then decreased with the temperature rising,and it reached its peak value(2 992.2 N/P) at 80 ℃,at this period,it was primarily due to densification effects fromsolid-phasesintering.When a reducing atmospherecontaining CO/CO₂ wasintroducedat 90oC,the pelets strength rapidly declined to approximately 1 OOo N/P,mainly due to the phase transformation of Fe₂ O₃ to Fe₃O₄ accompanied by lattice and volume changes,which disrupted the original sintered structure. In the reducing atmosphere,with the reduction time extending the strength sharply decreased within the first l. O h of reduction and then fluctuated at a lower level, which is attributed to the competition between reduction-induced structural damage and high-temperature re-sintering repair. This studyrevealedthestrengthevolutionmechanismofvanadium-titaniumpelletsunderthesimulatedconditionsof theupper blast furnace,which can provide a theoretical basis for the stable application and operational optimization of high-proportion pellets in blast furnace smelting.