Abstract: In connection with the weldability of dissimilar material between pure copper and 1Cr17Ni2 stainless steel and the low joint strength and quality stability, analyses on the factors which affect the quality of the welding are conducted, including the strcutural design of welded joint, welding material, technology parameters, manipulating skills.Rational structure and welding parameters are determined, technological test and qualification of welding procedure are conducted and mechanical property of welded joint, metallography and microstructure were observed and analyzed.