：The micro-structure and properties of Ag-4Pd alloy bonding wire after drawing and heat treatment are investigated,and effects of drawing rate and heat treatment temperature on mechanical properties,structure and fusing current of Ag-4Pd alloy bonding are are analyzed. The results show that the strength of Ag-4Pd alloy bonding wire will increase,and the elongation will decrease when drawing rate increased,the main deformation type are flip and twin. For? 0.050 mmAg-Pd alloy bonding wire,the broken load decreases and elongation increases when heat treatment temperature increases,the mechanical properties are excellent after heat treatment at 525 ℃. When increase heat treatment temperature more,the twin crystal is found in Ag-4Pd alloy bonding wire,and twin nucleation and subgrain grows are the main nucleation. The micro bamboo defects on surface are found after heat treatment with excessive tensile load. The electrical resistance of Ag-4Pd alloy bonding wire decreases after heat treatment. After data fitting,Ag-4Pd alloy bonding wire fusing current and fusing time is exponential function,and fusing current and loop is cubic polynomial function.