This invention discloses a data buffer storing method and a system under cluster environment, in which, the method includes: a customer end sends a data calling request, a server enquires if there are data to be called in the loca buffer storage, if not, it enquires the database, if so, it judges if the buffer storage data are invalid, if not, it returns the data result to the customer end directly, if so, it enquires the database to return the result to the customer end and writes it in the buffer storage, therefore, it guarantees that the data result to the customer end by the server is the newest and the method will not break the character of cluster technology.