Tianhai Energy Group came to CCTEG Xi’an Research Institute for maintenance inspection and technical exchange of mine seismograph. The two sides exchanged views on underground data acquisition, instrument operation and structure composition of trough wave seismograph. Tianrong Group is very satisfied with the service, maintenance process and problem handling. Since 2019, Tianrong Group has purchased 48 sets of mine seismographs From CCTEG Xi'an Research Institute, which are mainly used for geological structure exploration of coal mining working face. The instruments are used frequently and the application effect is good.