This paper presents an ozone-generation system with modular expansion and two-terminal driving mechanism to improve the ozone-generating performance. This study is concerned because the high AC voltage is often utilized to excite the ozone ceramic chip and a high withstand voltage are required for components, possibly causing a larger complexity of circuit design. This paper, therefore, suggests a half-bridge inverter integrated with dual-terminal driving method. The design helps to balance the current flow through the ozone ceramic chip and reduce the output voltage of transformer, while the amount of generated ozone becomes more uniform and stable. In the study, the circuit takes the leakage inductance of transformer and equivalent impedance of ozone ceramic chip as the resonant tank so as to enhance the system performance. A prototype of modular ozone-generation system is realized with four ozone ceramic chips. Test results made on this prototype help confirm the feasibility of the proposed approach for ozone system applications.