Study of welding the special cross-type joint is carried out by dual beam fiber laser welding technique. The effects of beam configuration and heat input on the dual beam laser welding characteristics of cross-type joint are systematically studied from weld formation, mechanical property and microstructure. The results show that the cross-type joint can be successfully fabricated by dual beam laser welding method, and the joint with good weld formation and satisfied mechanical property can be obtained. The joining zone is completely fused when the heat input exceeds 120 kJ/m. The weld formation of tandem dual beam laser welding is superior to that of side-by-side dual beam laser welding. The tensile strength of joint increases with the increasing of heat input. With the same heat input, the tensile strength of tandem beam configuration is bigger than that of side-by-side beam configuration. The tensile strength reaches 96.5% of the base metal with heat input about 140 kJ/m. The microhardness of remelting zone is higher than that of non-remelting zone, which is attributed to the reason that more acicular δ ferrites are generated in weld fusion line after remelting.