For a long time,the management of instruments used for earthquake precursory observation is non-sysmatic,so we develop the system for management of instruments used for earthquake precursory observation. This system implements the management of the whole life cycle of such instruments,including installation,checking in,running,failing,stopping/restoring observation,and being discarded. This system also implements the management of processing flow of repairing after an instrument failure,including registering of failure,processing,repairing,and inventory of spare instruments and parts. Based on the management information,comprehensive statistics of instruments and failure repairing can be made,supplying support for decision making. This paper mainly introduces the main technical aspects of system designing,and the main functions realized.