A method for storing keyword is disclosed, which includes: a keyword is operated respectively on the first and the second hash function in order to obtain the first and the second hash bucket addresses; the first and the second hash buckets are searched according to the first and the second hash bucket addresses; if no compressed keyword which conflicts with the compressed keyword of the keyword exists in the first hash bucket, the compressed keyword of the keyword and the pointer of the keyword are stored into the first hash bucket when the first hash bucket has remaining space; or the compressed keyword of the keyword and the pointer of the keyword are stored into the second hash bucket, when the first hash bucket has no remaining space and the second hash bucket has remaining space, and no compressed keyword which conflicts with the compressed keyword of the keyword exists in the second hash bucket. A method for searching keyword, a device for storing keyword and a device for searching keyword are also disclosed. The present invention enables increasing memory utilization ratio greatly and saving memory space and bandwidth.