The first Free Air Ozone Concentration Enrichment system (O3-FACE) was established in Asia under rice-wheat rotation system. The O3-FACE included O3 gas supply unit, O3 gas controlled-release unit and system communication and monitoring unit. The target O3 concentration for the FACE plots was 50% higher than the instantaneous ambient O3 concentration in the control plots. The O3 gas release was controlled at each FACE ring with a logic based on wind direction, wind speed and O3 concentration at the center of the plot. Based on 3 years results, the achieved fluctuation of O3 concentration was within ±15% of the target value for 85% of the time, and within ±20% of the target value for 90% of the time. The O3 concentration reduced in the FACE ring from border to center along the main wind direction. The variation of O3 distribution in FACE ring was lower than ±10% compared with O3 concentration at the center of the plot. The achieved fluctuation of O3 concentration was within ±20% of the target value for 80% of the time under low wind speed condition (wind speed＜0.3 m/s).