Abstract: Iraq F oilfield is a pore-fracture carbonate reservoir, and acidification is the main measure to increase production in this oilfield. The formation of effective main acid-eroded wormholes and the improvement of oil and gas seepage capacity are the key to the successful implementation of carbonate acidizing in this oilfield. When the acid injection rate is low, the acid can only dissolve the surface and deep penetration cannot be achieved. When the acid injection rate is too high, the main wormhole will produce more branches, resulting in high acid consumption and poor economic efficiency. In order to optimize the design of carbonate acidizing process in Iraq F oilfield, a method which can determine the optimal displacement and liquid volume was defined. The breakthrough volume of acid at different injection rates was measured by core acidizing flow tester and core micro-CT scanner. By determining the optimal injection rate and injection volume of acid, the optimal displacement and liquid volume of acidification are calculated equivalently. The experimental results show that the optimal injection rate for acid system is 1 mL/min, and the corresponding injection volume is about 1 PV. The optimal displacement of acidification by equivalent calculation is 0.5～0.7 m³/min, corresponding to an optimal liquid volume of 74～80 m³.Compared with the actual data on site, the consistency is high, which can provide data support and theoretical guidance for the optimization design of acidizing process parameters in this oilfield.