The chemical constitution requirement of welding-wire steel and the effect of elementary composition on the drawing and welding performance were analyzed. By strict controlling processes of V-extracting, steelmaking, refining and casting for smelting of vanadium-bearing hot metal of Chengde Iron and Steel Corporation, carbon, sili- con and manganese content in the lower range were over 90%. The sum of residual elements was less than 0.20%, especially the vanadium content was limited to 0.005%~0.008%. In addition T[O],[N] of welding-wire steel were less than 40×10 -6 , 50×10 -6 respectively. Through above measures, the break caused of composition control was decreased in drawing.