(Cu50Zr50)92Al8 metallic glass exhibited excellent superplasticity and diffusion bonding was succeeded in in the supercooled liquid region. The range of super-cooled liquid region is determined as 68 oC according to DSC curves. Through true stress-strain curves the experiment parameters of superplastic and diffusion bonding (SPF/DB) are chosen as bonding pressure of 200 MPa and bonding temperature of 470~490 oC. XRD patterns show that the metallic glasses after SPF/DB are partially crystallized and the hardness is enhanced. Three-point bending tests were conducted on samples after SPF/DB to fracture using a universal testing machine, and the bonding quality was discussed through the fracture surface analysis. Keeping the pressure a constant of 200 MPa, the metallic glasses after superplastic and diffusion bonding is best bonded when the temperature is 480 oC and the bonding time is 3 h.