Fractured-cavity carbonate reservoirs in Tahe oilfield have a serious heterogeneity, with numerous fissure, hole and cave.The bottom water is easy to breakthrough from high angle fracture, and it’s difficult to make water control for producing wells, so, the water plugging becomes important to oil production stabilization and water cut control. There is a significant progress of water plugging technology in fractured-cavity carbonate reservoirs in Tahe oilfield. The factors weight method for selecting well water plugging and five basic factors comprehensive analysis for plugging wells are formed. Three kinds of suitable plugging agents for fractured-cavity carbonate reservoirs are researched and developed. First, the soluble silicate, with good heat resistance and salt tolerance, is appropriate for well with small leakage and seam-hole reservoir. Second, the solidified grain, which has density selectivity and high strength, good heat resistance and salt tolerance as well, is suitable for fractured-cavity wells. Third, the organic-inorganic compound gel, with wateroil selectivity, is fit for fractured wells, horizontal wells and sidetracking wells. Based on plugging agent, the supporting water plugging technologies are formed and applied with good performance, including density selectivity, multistage slug holder plug and control pressure acidification.