<p>Viral infections play a crucial role in marine biogeochemical cycles, by regulating bacterial mortality and mediating nutrient and carbon fluxes. However, despite of their ecological significance, existing climate change models generally fail to incorporate virus-mediated ecological processes due to the current limited understanding of marine viral dynamics under global warming. While numerous studies have explored the effect of warming for viral decay and production, how temperature regulates the total abundance of marine viruses remains unclear. In this study, we conducted year-round measurements of viral production and decay rates in Qingdao’s coastal waters, with additional experimental warming treatments. The result showed that under <i>in-situ</i> temperature, the viral decay and production rate displayed distinct seasonal variations. With the exception of summer, elevated temperature stimulated both viral decay rate and production rate, and further improved the net viral production rate. While in summer, the net viral production rate turned negative, implying divergent threshold viral decay and viral production rate on warming. Our study deepens the understanding of the effect of global warming on marine viruses and provides scientific data for climate change models.</p>