The invention discloses an FA execution condition evaluation method and an FA execution condition evaluation system based on a mirror image message. The method comprises the steps of mirroring a collected message, thus obtaining the mirror image message; storing and forwarding the collected message, and meanwhile analyzing the mirror image message, thus obtaining a parameter evaluating the FA execution condition; and evaluating the FA execution condition according to the parameter. The system comprises a collection terminal, used for collecting the message; a collection switch, used for receiving the message collected by the collection terminal, and storing, forwarding and mirroring the message; a front-end processor, used for receiving the message stored and forwarded by the collection switch; a mirror image message processor, used for collecting the mirror image message of the collection switch, and analyzing the message, thus obtaining the parameter evaluating the FA execution condition. According to the FA execution condition evaluation method and system based on the mirror image message provided by the invention, the automatic evaluation of the FA execution condition is achieved through using the method of obtaining the message by port mirroring of the switch.