Brainwave feedback system and operation method thereof

A brainwave feedback system, adapted to generate feedback according to a brainwave signal of a user. The brainwave feedback system comprises: a brainwave sensing device, a server and an output component. The brainwave sensing device is configured to obtain a first brainwave signal of the user. The server stores a keyword string consisting of a plurality of sorted keywords. The server is configured to execute a feedback procedure when a first physiological parameter corresponding to the first brainwave signal falls outside of a predetermined parameter range, wherein the feedback procedure comprises choosing a keyword from the keyword string as a feedback keyword by the server, and outputting the feedback keyword. The output component is in communicable connection with the server, the output component presents a result of analysis that corresponds to the first physiological parameter.