This paper reports metallization of PZT (lead zirconate titanate) piezoelectric ceramic surfaces accomplished by an electroless plating process with proper after-treat-ment. With this method, nickel electrodes can be formed on PZT piezoelectric ceramic components used in piezo-electric ceramic wave filters. The main mechanical and electric properties of the piezoelectric ceramic conlpo-nents with this type of plated Ni electrode are as good as, or even better than, those with "fired-on" Ag electrodes. This paper introduces the detailed process of pretreat-ment, electroless plating and after-treatment, and dis-cusses the principles, results and various effective factors in each process, and indicates preferred operating condi-tions and control methods feasible in practical production.