An experimental set-up was designed for measuring the self-field losses of Bi2223/Ag HTS tapes using a transport current method. In this paper, Zr-based metallic glass composite with tungsten wire of 62~66 vol% in different diameters were fabricated by continuous infiltration casting process. Results show that the fracture strength and plastic strain of the metallic glass composite reach peak values at the diameter of tungsten wire of 80 μm. When the diameter of tungsten wire continues to increase to 150 μm, the fracture strength and plastic strain slump for the metallic glass composite. According to the analysis of fracture surfaces of the composites after tensile test, it is concluded that the ratio of surface to volume for different-diameter tungsten wire reinforced composites has an important effect on the tensile mechanical properties of composites through affecting the stress at interface between tungsten wire and metallic glass matrix, deformation and fracturing of tungsten wire and the formation and propagation of shear band in the metallic glass matrix