Abstract: The shielded metal arc welding (SMAW) of a high manganese steel part as a frog of railway track to a high carbon steel part as rails of the railroad is the welding of dissimilar steel.It is difficult to weld them together,because the poor weldability of the two kinds of steels and their different requirements for welding technology.The SMAW method was used to solve those problems by increasing the thickness of the intermediate layers and using U-groove symmetrical welding.The intermediate layer of rail sides was Ni-Cr-Mo alloy system,and that of frog side was Mn-Cr-Ni alloy system.All these materials were surfaced on the base metals at first,and then two pieces of base metals with intermediate layers were welded together.Other special procedures were used too.The test results indicated that the good welded joint was obtained and the carbides had not been precipitated.Meantime,the problems of welding deformation and residual stress was also solved.