Due to the contradiction between the demand of bridge construction brought by the rapid economic development and the backward technical reserve in the period of large-scale construction, China will face the increasing pressure of bridge maintenance in the next 10-30 years. Based on the latest research progress in the field of bridge evaluation and reinforcement, this paper introduces the chemical and physical methods of the main bridge disease monitoring technology, the bridge health monitoring technology and equipment including sensor technology and signal processing technology; The bridge health evaluation method based on time-varying reliability theory and historical data is compared, and the significance of structural parameter inversion relative to artificial intelligence is discussed; The partial reinforcement methods for bending, shearing and seismic resistance, the integral reinforcement methods for additional structural systems, and the electrochemical chlorine removal technology are introduced. The decision-making methods of maintenance and reinforcement of network level and project level are introduced. Considering the cross-disciplinary characteristics, some advanced sensors, signal processing technology and evaluation theory are also introduced in order to clarify the internal logic, and it may be able to play a certain inspiration and train of thought inspiration.