ADEOS was successfully launched on 17, Aug. 1996 by National Space Development Agency. This satellite marked a new era of global change study using Earth observing satellites. Global change study requires a comprehensive knowledge of the Earth system. Eight sensors on board ADEOS observe atmosphere, ocean and land simultaneously. Unfortunately, ADEOS has stopped its operation on 30, June, 1997 due to the breakdown of its solar paddle. However, almost 8 months of global data sets have been collected before the ADEOS accident. Data from ADEOS will bring better understanding of the Earth system.