In this paper,6005 A-T5 aluminum alloy plate was friction stir welded using a high welding speed. The microstructure evolution of different zones of the joint were investigated using various characterization methods. Mechanical properties of the joint were evaluated through tensile tests and micro-hardness measurements. It was shown that the nugget zone had fine equiaxed grains due to the dynamic recrystallization. The thermo-mechanically affected zone was characterized by plastic deformed and recovered structure because of the stains and thermal cycle subjected during the FSW process. The heat affected zone retained the same grain structure as the parent material,but grain coarsening occurred,which was also attributed to the thermal cycle during welding. The tensile strength of the joint reached 82.5% of the base material,and all the tensile specimens were fractured at heat affected zone,which was confirmed as softening region by microhardness measurement. In the condition of 106 cycles,fatigue limit at 132.9 MPa.The presented data of fatigue test provides solid base for pratical application.