Quartz flexibile accelerometer with flexible support, the pendulum assembly is connected with the instrument housing by two flexible rods. The bending stiffness of the flexible rod around the output shaft is very low, while the stiffness in other directions is very high. Its basic working principle is similar to that of liquid floated pendulum accelerometer. This system has a high gain servo amplifier, so that the pendulum assembly always works near the zero position. In this way, the bending of the flexible rod is very small, and the elastic moment introduced is also small, so the instrument can achieve high accuracy. There are two kinds of accelerometers: oil filled and dry type. The oil filled type is filled with high viscous liquid as damping fluid, which can improve the dynamic characteristics of the instrument and improve the anti vibration and anti shock ability. Dry type accelerometer adopts electromagnetic damping or air film damping, which is convenient for miniaturization, cost reduction and start-up time, but its accuracy is lower than that of oil filled accelerometer.