With the continuous development of Internet applications, telecom carriers invest more and more in IDC. In the construction of IDC, telecom carriers concern more about the security and stability according to the needs of the telecom service guarantee. In this paper, the design principle of IDC is analyzed, and some security problems are explained respectively from the network layer, business layer and basic management. Some measures about device security strategy construction and network isolation are proposed to implement the security construction strategy for IDC.