Abstract: A series of Ti_xSc_0.08Ce_0.08Zr_0.84O_1.96+2x(x=0.01, 0.03, 0.05, 0.07, 0.09)(TSCZ) ceramic materials are prepared by high temperature solid state syntheses. The phase structure and phase stability at 1500 ℃ for 12 h, 50 h, 100 h are analyzed by XRD, the thermal expansion coefficient of the material is measured by thermal dilatometer, and the mechanical performance is analyzed by vickers hardness tester. The results show that TSCZ materials with metastable tetragonal phase(t′) structure are successfully prepared. After 100 h heat treatment at 1500 ℃, the materials still maintain a stable t′ structure. With the increase of TiO₂ content, the thermal expansion coefficient, hardness, fracture toughness and sintering resistance are declined, and the Young's modulus are increased.