The relationship between input angle and output differential capacitance is presented for the realization of the capacitance signal detection of micro electromagnetic disk levitating gyroscope.The size and the shape of the capacitance electrode is given.By the implementation of the capacitance detection circuit

the output signal of the gyroscope is shown.Test results show that this gyroscope output result has a fairly good linearity which is accord with the capacitance computation.The minimum angle which can be detected by photo type gyroscope is not less than 0.1°

and the correspondent capacitance value is about 1 000 aF and can meet a demand for capacitance detection.