This paper studies the reconditioning technology of brush plating to composite surface of casting iron and chromium coating, compares several technological lines, selects optimum technology among them, and reconditions successfully a large hydraulic system. 本文研究了铸铁及电镀铬层复合表面的电刷镀修复工艺,并比较了几种工艺路线,选择其中最佳工艺,成功地修复了大型进口液压系统。