Abstract -- Two medium earthquakes, the July 17, 1998 Rei-li earthquake (ML 6.2) and the October 22, 1999 Chia-yi earthquake (ML 6.4), occurred at southwestern Taiwan. They were the two disastrous earthquakes in recent time since 1964. This project complete a report emphasized on the seismic observations, seismicity and the announcement of earthquake information for this two earthquakes. This report can be a reference to the CWB staff and be transferred to the GIS format for general query.