In order to improve the corrosion resistance and wear resistance of Inconel 690 alloy tube surface, the laser-fused assisted nitriding treatment to alloy tube surface is investigated. The microstructure, phase composition, microhardness and corrosion resistance of samples after treatment are tested and analyzed. The results show that the laser nitriding layer is mainly composed of CrN and γ phases which has good metallurgical quality without defects such as cracks and pores and the microstructures uniformly distribute with fine grains. The laser-fused assisted nitriding layers have the highest microhardness of 253 HV. After the laser-fused assisted nitriding treatment, the alloy tube has better corrosion resistance to Cl- ions with slight reduction of corrosion resistance to OH- ions.