To address the issues of cumbersome design procedures and long design cycles for the throttling profile of straight‑through single‑seat control valves，a high‑efficiency design method for the valve plug profile based on an orifice throttling model combined with variations in flow resistance coefficient is proposed.By establishing a calculation model for the effective flow area of the control valve at arbitrary openings，the analytical expression for the equal‑area curve is derived，and subsequently the mathematical expression for the valve plug profile coordinates is obtained.Based on this valve plug throttling profile design method，a preliminary DN50 straight‑through single‑seat control valve model with equal percentage flow characteristic is established.Simulation conditions are set according to the test requirements of GB/T 30832—2014，numerical simulation analysis is carried out，and flow coefficient tests are conducted on the control valve.The results show that the initial design exhibits flow coefficient simulation deviations beyond the allowable range specified in IEC 60534-2-4：2009 for openings below 60%.After optimizing the valve plug profile using an iterative method that mutually maps the structural characteristics and inherent flow characteristics，the simulation deviations across the full opening range are reduced to 0.30%~10.78%，meeting the standard requirements.The measured deviations of the optimized control valve under the main operating range and full‑open conditions are 2.24%~9.66%，meeting the accuracy requirements of the IEC 60534-2-4：2009 standard，and its flow characteristic approaches the equal percentage inherent flow characteristic.This study provides a reference for simplifying the design process of valve plug profiles and improving design efficiency.