A technology of Au thick film by ion plating have been worked out according to the investigation of the transition coating of Au thick film by ion plating. The technology consists of several steps including ionic cleaning of sample surface, plating of Ni Cu transition coating and heat treatment in the chamber etc. All steps can be realized by once charging. The results of test run show that number of reciprocating movement of the friction surfaces reached 120 times at the speed of 2.5 m/s, which meet requirement completely.