Embodiments of the invention relate to a method and device for analyzing features of data in a server. The server comprises to-be-analyzed data and a database, wherein the database comprises at least one data type and a feature extension rule corresponding to each data type. The method comprises the following steps of: determining a data type of the to-be-analyzed data according to the at least one data type in the database; determining a feature extension rule corresponding to the data type of the to-be-analyzed data; determining at least one extension feature of the to-be-analyzed data and data corresponding to each extension feature according to the feature extension rule corresponding to the data type of the to-be-analyzed data; and outputting the data corresponding to each extension feature of the to-be-analyzed data. According to the method and device for analyzing features of data in the server, a series of extended features of the to-be-analyzed data can be mined through the feature extension rules from single and simple data types, so that the workload of constructing a feature system during data analysis can be decreased.