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A program of adaptive quadrature demodulation is proposed to supply the gaps in the traditional analog detection technology of a silicon micro-machined gyroscope (SMG). This program is suitable for digital phase locked loop (DPLL) drive technology that proposed in other papers.In addition the program adopts an adaptive filtering algorithm,which selects the in-phase and quadrature components that are outputs of the DPLL of the SMG' s drive mode as reference signals to update the amplitude of the in-phase and quadrature components of the input signal by iteratively.An objective of the program is to minimize the mean square error of the accurate amplitudes and the estimated amplitudes of SMG' s detection mode.The simulation and test results prove the feasibility of the program that lays the foundation for the further improvement of the SMG' s system performance and the implementation of the SMG system' s self-calibration and self-demarcation in future.