Electroless nickel process, with a uniform layer, can be used in auto industry for plating a protective layer of nickel on some complicated auto parts, like wheel gears, radiators and injectors. The aluminum radiators can have good solderability after depositing a 10um layer of nickel. After electroless nickel process the dimension error of gears can be easily kept in the range of ±0.3～0.5um, which needs further machining if electroplating is adopted. When the electroless nickel process is used for plating on oil injector, the nickel layer can offer good ability of anti-fuel corrosion and abrasion. Normally, fuel corrosion and abrasion can lead to the widening of the oil jet hole and the high oil consumption, making the delivery of horsepower beyond standard and speeding the damage of engines. Thus the electroless nickel layer can effectively prevent fuel corrosion and abrasion to increase the reliability and operation life of engines.