High water temperature is one of the most important factors causing mortality of reef building corals. However, the knowledge about how the decline of coral cover caused by heat stress varies depending on intensity of the event is limited. The aim of this study is to reveal the spatio-temporal dynamics of coral cover in Okinawa and to evaluate how the impact of heat stress on the coral cover varies with the intensity of the stress, coral community characteristic (e.g. dominant genus and colony morphology), reef zone (e.g. reef-flat and reef-slope), and local anthropogenic stress (e.g. turbidity). We analyzed coral cover data gained by Monitoring 1000 Project from 2003 to 2017 at 269 sites in Okinawa. We classified these sites into 20 regions (tens km²) and reef zones. We quantified degree heating weeks (measure of cumulative heat stress) as the intensity of heat stress, and content of suspended particles in sea sediment (measure of turbidity) as the intensity of local anthropogenic stress. The temporal dynamics of coral cover varied spatially: the cover monotonically increase around Okinawa island, but once decreased and increased afterward near Sekisei Lagoon. We will discuss the reason why the dynamics varied among these areas.