Abstract: According to requirements of design and test standard, when Vickers hardness on 45° center position of fillet weld was measured uniformly, indentation distance must be assured of 1 mm, Vickers hardness indentation of fillet weld, heat-affected zone, base metal and so on should be arranged in line. Vickers hardness tester whose type was HV-120 with 98 N of loading was used in experiment. In order to meet standard requirements, two square magnets were placed on job platform of hardness tester to fix the specimen which was not allowed to move up and down, indentation distance was rigidly defined of 1 mm by accuracy of vernier, centre line of fillet weld was determined of 45° by triangle plate with 45°. The operating method was simple, indentation of straight line arrangement was equation, testing results were accurate and reliable, and it was satisfied for the requirement of design and test standard.