Abstract: As a core component in high-voltage switchgear, the wear condition of the contacts of vacuum circuit breakers directly affects the performance and service life of the circuit breakers, thereby affecting the stable operation of the entire power system. In order to timely detect and accurately evaluate the wear of vacuum circuit breaker contacts, this article will start from the overview of vacuum circuit breaker contacts, analyze the types of vacuum circuit breaker contact wear, and construct a vacuum circuit breaker contact wear diagnosis system based on multi-source information fusion. In order to provide strong technical support for the safe maintenance and efficient operation of the power system.