1. A file transfer security system, comprising: a storage system; at least one processor; and a file transfer securing unit stored in the storage system and being executable by the at least one processor, the file transfer securing unit comprising: an interception module operable to intercept a file transfer request sent to a file server from a client computer, and record relevant information of the file transfer request; an analysis module operable to analyze the relevant information to assess the need for examination of the file transfer request; a notification module operable to notify an auditor to examine the file transfer request and award approval or rejection thereof; a receiving module operable to receive an examination result from the auditor; and an execution module operable to execute file operations according to the examination result.