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Legacy systems is a difficult problem to deal with, the outdated technology makes it difficult to do directly modify to codes, aging hardware environment make the system slow to respond, but they become more and more indelible because of the deep bundle dependencies. Although this is a time-consuming and difficult task, but the renewing of legacy systems have to be seriously faced because of its importance to enterprise. The concept of cloud computing has been proposed to build a private cloud-based information systems management model into an efficient, cost-effective solutions, virtualization technology has been used a lot, and it provides a new direction for the migration of legacy systems. In this paper, wo decomposition analysis of the legacy systems, combine legacy system migration solutions and virtualization technology with the application of cloudstack which is an open source cloud platform owned by Citrix Systems, using SOA and web services technology on the part of the system functions to do the reconstruction, we build an enterprise private cloud platform.