The invention provides a case searching method and system based on the correlation degree. The method includes the steps: establishing character sets representing case classifications according to character words extracted from a case record set; acquiring a candidate correlation library according to the character words, the case classifications and a calculated correlation degree between the character words and the case classifications; finding out the character sets corresponding to the case classifications according to received search character words and the coordinate library where the search character words locate, and performing searching on the cases by adoption of all the character words in the character sets corresponding to the case classifications. During case searching, the cases can be searched according to the search character words and other character words associated with the search character words, and then the cases can be searched quickly and accurately in a case library with a large number of cases.