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Taking into account the measures mentioned earlier for preventing corrosion caused by inorganic salts in crude oil, as well as the background of various desalination cases, the optimal desalination techniques vary depending on the characteristics of the crude oil. There is no universally applicable \"most effective\" technique; instead, a solution must be chosen based on the properties of the crude oil. First, in terms of overall suitability, high-frequency high-voltage electrodesalination is the most widely used technology in industry today, offering the best overall desalination results. By utilizing high-frequency high-voltage electric fields, it is possible to keep the salt content in the desalinated crude oil at ≤3mg/L and the water content at ≤0.15%. Its power consumption is more than 50% lower compared to traditional AC-based desalination methods, and its processing capacity is over 50% higher. This technique is highly adaptable to both conventional crude oils and heavy, low-quality crude oils. After being adopted by refineries such as Shandong Jingbo Petrochemical and Daxie Petrochemical in China, desalination efficiency increased by more than 50%, significantly reducing the risk of corrosion in subsequent equipment. II. Optimal performance for specific scenarios: High-salt, high-water-content crude oil – DC-AC desalination technology utilizes a combined DC-AC electric field to significantly improve the efficiency of droplet coalescence in high-salt crude oil, meeting the demands for deep desalination of such crude oil. Crude oils with complex compositions that are difficult to process: The combined ultrasound demulsification + electrodesalination technique utilizes the cavitation and collision effects of ultrasonic waves to break down the persistent oil-water emulsion film in advance; acting as an auxiliary process to electrodesalination, it helps overcome the difficulty associated with demulsifying such crude oils using conventional electrodesalination methods. Heavy and ultra-heavy crude oils: Dual-frequency composite electric field electrodialysis technology. Schlumberger NATCO’s proprietary technology has been successfully applied in projects involving heavy crude oils in countries such as Kuwait and Colombia. It is capable of handling low-quality crude oils with high viscosity and high electrical conductivity, preventing electric field breakdown and enabling stable deep-level desalination.