The power for the wireless monitoring systems in orthopaedic implant can be supplied by stiff lead zirconate titanate(PZT) piezoelect ricceramics. This paper describes the power generation characteristics of PZT ceramics and its equivalent circuit, input/output characteristics, and positions. These characteristics were verified by simulations and experiments with a single PZT and four PZTs respectively. A power circuit design and a monitoring system design are also given. The results verify that the power from the PZT can be regulated into useful, steady power for the circuit.