The selection principle of HR3C steel welding consumable in engineering application was discussed. The results show that the weld metal is mostly different from the base metal when the selected consumables are used under engineering conditions. The selection of high-quality,proper welding consumables and optimized welding process is an important technical means to control and improve the weldability of the steel. The so-called "structure matching" principle of dissimilar welds is the use of nickel-based austenitic welds with the Ni-Cr-Co-Mo alloy system to ensure that the joint can obtain satisfactory comprehensive service properties（including high temperature properties） and weldability. GTAW is the practical process in engineering,and test results indicated that the comprehensive properties of the typical welding consumables have obvious advantages.