With the increasing of users and the demands which are transforming from the monotonous traditional service to network service,Multiple space environment web applications including browser-client,rich-client and mobile-client applications have been developed by SEPC(Space Environment Prediction Center,NSSC,CAS)during the past few years.The architecture of Operational Space Environment Technology System(OSETS) that these applications rely on is described and the description of structural optimization of the architecture is provided.To demonstrate the evolution of the OSETS,three web application examples for e SpaceWx,Space Weather Situation Awareness Picture(SWSAP),Plug-and-Play SWx Analysis and Plotting Program(PPSWAP) are presented. With the increasing of users and the demands which are transforming from the monotonous traditional service to network service, multiple space environment web applications including browser-client, rich-client and mobile-client applications have been developed by SEPC (Space Environment Prediction Center, NSSC , CAS) during the past few years. The architecture of Operational Space Environment Technology System (OSETS) that these applications rely on is described and the description of structural optimization of the architecture is provided. To demonstrate the evolution of the OSETS, three web application examples for e SpaceWx, Space Weather Situation Awareness Picture (SWSAP), Plug-and-Play SWx Analysis and Plotting Program (PPSWAP) are presented.