The invention provides a virtualization computer system which can achieve inter-domain data sharing, which comprises a computer hardware device and a software unit running on the computer hardware device. The software unit comprises a master domain, a guest domain and a channel between the master domain and the guest domain. The kernel of the master domain is provided with a file system module and a shared data server module. The kernel of the guest domain is provided with a shared data client end module. The inter-domain channel is used for exchanging data between the shared data client end module and the shared data server module. In the shared data method provided by the invention, files are accessed through the memory page remapping mechanism based on semi-virtualization via the inter-domain channel between the shared data server module and the shared data client end module. The invention solves the problem that data can not be effectively shared between different domains in the prior art, and achieves centralized management of stored data and reduces the maintenance cost, which is good in performance, and efficient as well as widely applicable.