In this paper, the local mechanical properties of the welding joint for 15CrMoR base metal and nickel based welding metal were systematically studied by means of microstructure analysis, digital image correlation (DIC) test and hardness test. Based on DIC method, the whole field strain nephogram was obtained for the welding joint of nickel based welding metal during tensile process. It was found that the strain in the welding area was small and inhomogeneous, but it was large in base metal area, while it was uniformly variated in the heat affected zone. Then, the local stress-strain curves of different regions for the welding joint were constructed, and the distribution of local mechanical properties parameters in the welding joint was revealed. Based on the microstructure analysis of welding joint, the distribution of local mechanical properties parameters was closely correlated to the distribution of microstructure. Finally, combining the distributions of microhardness and strength parameters in the welding joint, the correlation equations of them were established, which were convenient to estimate the local mechanical parameters for the welding joint of nickel based welding metal.