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SiO 2 -ZnGa 2 O 4 :Cr 3+ glass ceramics were prepared by a sol-gel method. The influence of TiO 2 addition on the crystallization behavior and photoluminescence properties were investigated in detail. The nonisothermal crystallization kinetic studies based on Kissinger, Ozawa, and Matusita models were performed on the SiO 2 -ZnGa 2 O 4 :Cr 3+ glasses with different amount of TiO 2 . The introducing of TiO 2 component as nucleant in the glasses can significantly reduce the crystallization activation energy. The results of the crystallization kinetic calculation and scanning electronic microscope observations indicated that the crystallization of ZnGa 2 O 4 :Cr 3+ from the glass possessed a surface nucleation and growth mechanism. Near infrared emission of the glass ceramics was obtained under the excitation at 414 nm. The crystal field parameters around Cr 3+ and excited state dynamics of Cr 3+ were studied in detailed.