Abstract: Based on Windows. "unmanned monitoring system of dynamic time change of earthquake precursor data in the network" is developed. By studying the format of earthquake precursor obseration data of Anhui provincial earthquake precursor data transmision network, which are obtained from 14 seismic stations and 117 observational items over the province, the main functions of this system are: collecting, retrieving and analyzing the precur or data. Playing and tabling, reporting recording lack of observation data automatiLally. This system can also monitor the precursor data change with time of earthquake stations and precursors quickly and visually.

Key words: Earthquake precursor data, Earthquake precursor data transmission network, Dynamic time change, Phonetic warning