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High-precision suppression technology for the cold rolling mill control precision of hydraulic AGe system is put forward higher requirements. On the basis of related theory introduction, the article respectively analyzes the forward feedback AGe, monitor AGe system and a second flow control AGe system in detail, and expounds the various factor's influence on the control precision of the system. In addition, this article also makes reasonable modeling analysis and simulation for each main part, which provides the basis for optimization design of hydraulic AGe system of cold rolling mill and the research of the control performance.