Abstract: The Silicate glasses in TiO₂/SiO₂-Al₂O₃-MgO system doping with 0-1.8 wt% TiO₂ were prepared by the conventional melt quenching technique, and the effects of TiO₂ on the density, bending strength, compressive strength, compression modulus and structural stability were investigated. When the content of TiO₂ is less than 1.5 wt% (mass fraction), the density, bending strength, compressive strength and compression modulus increase with the increasing of TiO₂ content, and the optical band gap decreases with the TiO₂ content increasing. As the content of TiO₂ is more than 1.5 wt%, the density, bending strength, compressive strength and compression modulus decrease with the increasing of TiO₂ content, and the optical band gap increases with the increasing of TiO₂ content. When the content of TiO₂ is 1.5 wt%, the mechanical properties of the TiO₂/SiO₂-Al₂O₃-MgO system is excellent, and the bending strength, compressive strength, compression modulus and optical band gap of the glasses is 110.36 MPa, 240.18 MPa, 115.03 GPa and 3.75 eV, respectively. The addition of TiO₂ reduces the numbers of the non-bridging oxygen in the glass network structure, increasing the structural stability of the investigated glasses. So the network structure of the isolated island is rejoined, which significantly improve the mechanical properties of the glass. However, excessive TiO₂ force its structure of the bridge oxygen bond to generate non-bridging oxygen, which significantly reduces the structural stability and mechanical properties of the investigated glasses.