Abstract: ZrO₂-8Y₂O₃ (mass fraction/%) thermal barrier coating was prepared on DZ411 alloy substrate by atmospheric plasma spraying. The high temperature oxidation properties and the section micromorphology after oxidation of the thermal barrier coating were studied. The high temperature oxidation life prediction model was established and verified by experiments. The results show that the oxidation mass gain Δm and the thermal growth oxide layer thickness of the thermal barrier coating increased in a parabolic pattern during oxidation at 940, 1 030℃. The Δm increase rate of the thermal barrier coating at 1 030℃ was larger than that at 940℃. Compared with the experimental results, the predicted value of the themal growth oxide layer thickness by the established high temperature oxidation life prediction model was within the dispersion band of ±2 times, indicating that the established life model and the analysis method could predict the high temperature oxidation life of the thermal barrier coating well.