Abstract: The flue gas reaches wet saturation state after wet desulfurization tower in coal-fired power plant, and directly discharged will lead to large amount of moisture loss. Taking flue gas water recovery system as the research object by the direct spraying method, and explores the characteristic parameters of the flue gas containing water saturation, and builds an integrated device integrating with the flue gas desulfurization, water recovery and deep emissions reduction, and analyzes the operation performance. The results show that the saturated flue gas moisture content varies greatly with the flue gas temperature, and the higher the flue gas temperature, the higher the moisture content. The flue gas water recovery is obviously affected by the cold source medium. The theoretical flue gas water recovery rate is determined by the flue gas import/export moisture content and flow. The actual flue gas water recovery rate is up to 453.62 t/d, and the highest water recovery efficiency is 26.44%. The direct spraying method reduces dust emission concentration by 66%~80% and sulfur dioxide emission concentration by 50%~60%. The research results provide engineering guidance for the flue gas water recovery and utilization.