Abstract: The characteristics of alloy HSn70-1 is analyaed.Through a series of tests including optimizing Ni and Mn ratio,process tests after adding the rare earth element and corrosion resistance tests of condensing tubing,the range of the alloy elements is determined to meet production and processing requirements and guarantee comprehensive properties of products.The study also covers the relation ship of mechanical properties and annealing temperature of HSn70-1 with rare earth.Proper percentage of composition elements and process for HSn70-1 condensing tubing are determined.