The invention discloses a method for managing data files. The method includes setting virtual files corresponding to the data files in a computer system; reading the corresponding data files via the virtual files in read processes; reading the corresponding data files via the virtual files in write processes and writing log files; reading the log files in arranging processes, reading the corresponding old data files via the virtual files in the arranging processes, generating new data files and changing corresponding relations of the virtual files so that the virtual files correspond to the new data files. The invention further discloses a device for managing the data files. According to the scheme, the method and the device have the advantages that memory transfer operation which is required to be carried out when a Cache is utilized can be omitted, the data security can be improved, and memory resources can be saved; coupling among the arranging processes, the read processes and the write processes can be prevented, and the operation and maintenance costs can be reduced.