With different laser processing technologies such as laser alloying, laser repairing and laser solid solution strengthening, two kinds of steam turbine blades with 2Cr13 and 17-4PH are hardened and repaired. Before and after hardening or remanufacturing, the microstructures, microhardness, residual stress, wear resistance, anti-corrosion and anti-cavitations properties are measured. The results confirm that laser processing technologies could be applied to strengthen and repair turbine blades.