Abstract: The technology of electroless nickel p lating, recently developed surface2treating technology, is com2 paratively simp le and the p roperties of the p lating coating are excellent. Because the coating of nickel p lating is high in hardness and is low in friction, its wear resistance is excellent. The corrosion resistance of the coating is very outstanding due to the amorphous structure inside the coating. The electroless p lating has been widely app lied to such industries as petroleum, chemicals, machinery, die, electronics, aviation and aerospace, especially to p lating the base2layer of hard disks of computers and various valves in chemical industry requiring corrosion resist2 ance. Electroless multi2component p lating and electroless composite p lating further imp rove and enrich ordinary electroless nickel p lating and extend the app lication of electroless p lating.