GVSS is developed for large-scale drug screening. It vastly reduces the cost and time of screening by the distributed computing infrastructure. From data preparation, docking simulation, results analysis to visualization, all the services in the virtual screening process are supported by the GVSS web portal. Both Audock version 3 and version 4 are supported by GVSS2 now. GVSS also provides around 700 proteins from Protein Data Bank and about 10 million drug compounds from the ZINC database as the default data source.