Abstract: The recycle water for the heat medium-water heat exchanger in oil transmission stations, featured by high contents of chlorion and dissolved oxygen, high hardness, and high flow velocity, gives rise to severe corrosion and scale buildup in the water piping. The corrosion control and scale arresting agent, IMC-50-S, is developed based on field investigations and analyses. Consisting of inorganic corrosion inhibiting component and organic phosphate which are prone to resistance to corrosive water, the agent can generates a protective film over metallic surface to effectively restrain metallic corrosion. In addition, because of its high thermal stability and adaptability to different pH values, IMC-50-S also has an excellent scale-arresting effect at high temperature and over a wide pH range. Analyzed are the test results about the corrosion of recycle water, the effects on corrosion rate in different concentrations of corrosion inhibitor, different soaking periods, and different pHs of solution. The tests show that, for A3 steel, IMC-50-S can control the corrosion rate down to less than 0. 07 mm/a, and can achieve a scale-arresting rate of over 90%.