Abstract: As one of low temperature high strength steel, EH36 is widely used in key construction of ship.Based on the thermal-physical properties of EH36, 3D finite element simulation is carried out to analyse the temperature field and distortion distribution. To simulate the actual welding process, some technologies, such as APDL program used for development and birth &death skill, are applied in 3D multi passes welding.Thus the temperature field and weld distortion distribution in 3-directions are obtained.The result of simulation shows that there are many different distortions between the first pass and the second one, and that difference lies between the firstly welded part first and the later welded part.Further, the distortions of U-shape groove and V-shape groove were compared, the angle deformation of workpieces with V-shape groove is obviously greater than that of the U-shape groove at the same area of weld crass-section, both of them share with the same areas, same welding process and simulation process.