The adaptive circuit of mercury capacitance acceleration transducer is introduced. The application background of micro capacitance measurement circuits and their development now in our country and foreign countries are described. Aimed at the work principle of mercury capacitance acceleration transducer, the selection of scheme adaptive circuit is established. Therefore, PS021’s characteristic, function and principle of work are introduced. The micro capacitance measurement module designed based on PS021 chip by the method of system design can measure micro high precision capacitance, so it has a good application prospect.