Aiming at the security requirements of virtualization data center, the security design of virtualization data center is put forward. The security problems of virtualization data center are analyzed, the three-dimensional security model of virtualization data center is set up from isolation of channel, control of connect and dynamic move of security policy based virtual computer. Use multi-links for binding connect the 2-layers exchange board, realizing the load equilibrium and redundancy backup based on physical port. Use exchange board and fire wall to realize interview control. The analysis results show that the deign realizes security protection of virtualization data center