Abstract: Based on Goodman diagram and combined with the results of steady-state stress analysis and modal analysis, a method of assessing weak position of blade vibration was put forward in the paper. Based on the method, effects of weld height and welding angle of TC17 titanium alloy blade test component on blade vibration safety was analyzed in the paper. Besides, effects of weld height and welding angle on the vibration safety of the blade element in the first order bending mode and the first order torsion mode were also analyzed. The analysis results showed that for the first order bending mode of blade test component by linear friction welding, effects of blade welding angle and weld height on the vibration safety of blade were more than 29%, while for the first order torsion vibration safety, effects of welding angle and weld height are 227%and 392%, respectively. By analyzing effects of linear friction welds in the first order bending mode and torsion mode, the suitable welding position of TC17 titanium alloy blade test component by linear friction welding was obtained.