Research results: The research on the bridge health monitoring and evaluation system is at the beginning stage and it has long way to go to put the system into practice. Nowadays only the response of low frequency can be measured precisely and only can reflect the entire status of the structure. However, even such response can be reflected in the entire status, but it is easily disturbed by the noise, error and unstable factors because the measured value is too small. The development trend of monitoring technology for bridge health is as follows; The first is to reduce the noise and unstable factors and the second is to enhance the sensitivity of diagnostic method of bridge damage to realize the quantization of the bridge damage through optimizing the technology.