Computing resources of both hardware and software tends to be located at a certain place, as most professional software supplied by a computing Grid demands powerful computing hardware. The computing Grid in this paper provides work processing with legacy professional software, without any modification or adaptation of the software. The simplified computing Grid model consolidates server farms with multiple Web service providers. A client may access the computing Grid through redundant Web interfaces and experience faster Web interface. The computing Grid would not become inaccessible until all the coordinators crashed down.