Oxides on metal surface will deteriorate quality of deep processing.Using acid pickling to remove oxides is a conventional method,but will pollute environment and increase operating cost etc.The authors compared and analyzed many descaling methods such as high-pressure water jet-sand blasting descaling and pickling descaling etc.As viewed from technology and economics,feasibility of high-pressure water jet-sand blasting descaling instead of pickling descaling is discussed.Working principles,system plan and application of high-pressure water jet-sand blasting descaling are described.Future of high-pressure water jet-sand blasting descaling is predicted.