Abstract: In geostationary meteorological satellite systems raw data obtained from visible infrared spin-scan radiometer (VISSR) has to be synchronized and buffered before it is sent to data processing center(OPC). Synchnonzation is necessary for recovering a good image in which the pixeles are precisely positioned and for the accurate measurement of wind speed which is a majorapplication of the data, and buffering is for easing data transmission and interconnectionwith computers.So, from the point of view of utilizing the data correctly, syn chronization and buffer are indispensable techniques in the systems. This paper presents the fundamental functions and the detailed features of the synchronizer/data buffer (S/DB) systems which have been successfully used in Meteosat and GMS systems.