Abstract: The Ordovician reservoir in block 4 of Tahe Oilfield belongs to typical complex carbonate reservoir.When the reservoir development enters the stage of high water cut，the well fluid production decreases sharply，well outflow water has become a major problem in oilfield development which restricts the oil recovery.Taking S65 and S48 fractureeavity units in block 4 of Tahe Oilfield for example，based on the summary of three types of waterproducing including slow outflow water，sudden outflow water，and intermittent outflow water，this article analyzes corresponding mechanisms of water producing according to production dynamic characteristic by using the drilling，logging，seismic data and so on.The reasonable and effective measures for water controlling is proposed:injecting water to maintain energy in lower part for slow outflow water；adopting the plugging water and sidetracking in the higher part for sudden flow water；adopting shutin coning control method for intermittent outflow water.These water controlling measures for the scale and scope of water plugging and water channeling can guide the development of this kind of reservoir effectively.

Key words: carbonate reservoir, dynamic characteristic, water producing type, water producing mechanism, water controlling measures