Abstract: In order to evaluate the long-term service performance of Ti60 alloy under high temperature conditions and make its research results more in line with practical industrial application needs, this study analyzed the evolution law of plastic properties of Ti60 alloy for mechanical grinding tools through high temperature exposure experiments. First, prepare Ti60 alloy rods and obtain uniform equiaxed fine grain structure through precision hot processing. Process the alloy into specimens of different sizes, perform 3-90 hour heat exposure treatment at 500 ℃ and 550 ℃, and use Gleeble-3500 thermal simulation testing machine to test its plastic strain at 1000-1200 ℃. The results show that the increase in hot stretching temperature can partially compensate for the performance loss caused by thermal exposure, and the plastic strain is the highest at 1200 ℃, which is 1680 μ ε; The increase of heat exposure time and temperature will significantly reduce the plastic properties, such as a significant decrease in plastic strain after 550 ℃/90h heat exposure, and further decrease to 1000 μ ε after 400h ultra long heat exposure. Microscopic analysis shows that performance degradation is caused by coarsening of the alpha phase, weakening of grain boundaries, and element segregation, while a thermal expansion coefficient below 9.0ppm (corresponding to 550 ℃/90h) can be used as a critical criterion for plastic instability. Research has confirmed that controlling the heat exposure temperature below 500 ℃ can maintain the plastic stability of Ti60 alloy, providing important basis for high-temperature material selection and life prediction of mechanical grinding tools.