<p>A short-time pulse current treatment method was used to treat Incoloy825/20CrNiMo composite plates after hot rolling, and the effects of current density and treatment time on the comprehensive performance of the composite plates were systematically investigated. The microstructure of the composite plates was observed by scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy, and the mechanical properties and corrosion resistance of the composite plates under different conditions were analysed using a tensile testing machine and an anodic cathodic polarisation test in 3.5 wt.% NaCl solution. The results show that after pulsed current treatment of 47.34 A/mm² and 5&#xa0;min, the degree of recovery and recrystallisation of Incoloy825/20CrNiMo composite plate matrix is improved, and the tensile strength is raised to 677.6&#xa0;MPa with an elongation of 41.5%. The robust metallurgical bonding interface formed on this basis and the high-frequency low-Σ CSL (coincidence site lattice) improved the corrosion resistance of Incoloy825/20CrNiMo composite plate.</p>