The mechanical properties at room temperature and the dynamic mechanical properties at different temperatures of Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅ metallic glass composite were investigated. Results show that the tensile strength at room temperature of this metallic glass composite is about 1350 MPa and its fracture strain is approximately 0.13. With increasing the temperature, the state of the metallic glass composite changes from elastic to viscoelastic. The physical parameters, such as loss factor and correlation coefficient, are introduced to analyze the dynamic mechanical behavior under the framework of quasi-point defects model, and the theoretical curve fits well with the experiment data. Therefore, the quasi-point defects model can well describe the dynamic mechanical behavior of Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅ bulk metallic glass composite at different temperatures.