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The paper do research on the impact of the Amplifier AD8692 characteristic parameter of the stability whole control system. The Amplifier AD8692 is used in the system to deal with the feedback shifting signal. The experiment proved that, the Amplifier AD8692 characteristic parameter departure may cause self-oscillation, and then the performance of the complete device descended, meanwhile the system became unstable . Several batches of Amplifier were tested and contrasted,and confirmed that it is by the Amplifier open loop gain being too large。The devices should be selected by the parameters before they are fixed。