The fraud scripts used by telecom scammers are becoming more and more complex. It is difficult to accurately distinguish the fraud script from one of the messages. In order to improve the accuracy of complex fraud scripts

this paper improves the existing keyword combination strategy. The sequential relational operator is introduced into the original logical operator

thereby improving the expression ability of the keyword combination strategy. The sequence operator can quickly defi ne complex fraud script strategies

and realize accurate identifi cation of fraud scripts.