In order to reduce the deflection of the accelerometers with asymmetric sensors, the reasons and the suppression methods for vibration deflection are studied. Firstly, the mathematical model of the system is analyzed. For the asymmetric sensor when symmetric capacitors detection circuit is used, even parameters will be existed in the relation equation between the circuit output and the displacement of the mobile plate inside the sensor, so the vibration deflection comes about. And then, the nonlinearity of the torquer is analyzed. The equivalent symmetric method through electrostatic force bias is discussed. It is obtained that the method cannot restrain the vibration deflection. Additionally, an equivalent symmetry compensating method for asymmetric sensor and an equivalent symmetry method for electrostatic torque are proposed . It is found that the method can improve the vibration deflection through theoretical analysis. Finally, contrast experiments are made. Results show that as equivalent symmetry method is used, the deflection of the accelerometer with poor symmetry sensor under the vibration is reduced, and the linearity is well kept.