Abstract: Friction stir welding of T2-H62 was investigated in this paper.Many experiments were carried on the welding machine modified by ourselves.The material,shape and dimension of the nib had been optimized.The significance sequence of processing parameters of friction stir welding had been calculated by signal-noise(SN) ratio experiments.The mechanical performance of T2-H62 welded joints was tested through tensile experiments,hardness tests and bending tests.