Abstract: A TIG-MIG indirect arc welding system was set up by reforming the traditional TIG welding system in which the arc was ignited and burnt steadily between the tungsten and the welding wire.This new process was used to deposit CuSi3 welding wire onto the 30CrMnSi steel plate.The effect of welding current and feeding wire speed on the consistency of the welding process and the effect of the flux, welding current, welding speed and distance between the tungsten and the welding wire were analyzed by changing the welding process parameters.The result shows that by choosing the proper process parameters, low heat input and high deposition ratio joint can be obtained in TIG-MIG indirect arc welding process, at the some time, the deleterious iron picking up can be also retrained for the decreasing of the mutual solution between the deposited metal and the work piece.