In this paper,the butt welded joints of 10 mm AH36 steel under different welding parameters were obtained by laser arc hybrid welding,and the forming characteristics,microstructure and mechanical properties of weld under different welding parameters were analyzed. Based on the finite element software,the typical temperature field distribution of laser hybrid welding was obtained,and the welding deformation of 6 m×6 m×6 mm large panel was simulated. The results show that the laser power can significantly change the welding penetration,and also has a certain impact on the weld morp-hology;the influence of welding current on the penetration is less than that of the laser power,and the welding current has a great impact on the weld width and morphology;the weld zone of laser hybrid welding is mainly acicular ferrite and granular bainite,the microstructure of coarse grained zone is mainly granular bainite,ferrite and martensite;the change of laser power has little effect on the hardness of arc zone,but has certain effect on laser zone. The hardness of weld improves as the laser power increases,the increase of welding current makes the hardness of weld zone and heat affected zone decrease as a whole;The constraint position has an important effect on welding deformation,the closer the constraint position is to the weld center,the smaller the postweld deformation.