In order to develop the welding materials for Q960 high strength steel,by adjusting the ratio of different elements in Mn-Mo-Cr high strength steel flux cored wire,the influence mechanism of element on the microstructure and mechanical properties of welded joint was analyzed,and the optimum element proportion was achieved. The tensile test,impact test and microstructure analysis were conducted based on the orthogonal test. The results show that considering the tensile property and impact property,the optimum ratio of Mn,Mo and Cr in the weld is 1.2 wt.%,1.5 wt.% and 1.2 wt.%.When the Mn and Mo element content increase,the microst-ructure of welded joint transfers from proeutectoid ferrite into acicular ferrite,martensite and bainite. The solution strengthening and phase transformation strengthening make the tensile strength of welded joint improve gradually,but elongation reduces gradually. The weld with the largest acicular ferrite content has the best impact toughness.