In order to improve data security protection, this paper introduces the key security technologies of cloud computing based on the introduction of cloud computing technology, and proposes a security architecture design based on cloud computing. The network design of the entire data center is divided into two parts: the back‐end is Using cloud computing related technologies and supporting multi‐architecture integration of business resource network, network, computing and storage resources are built into a virtual resource pool; the front end is based on the traditional Server Farm modular data center structure. Corresponding security technical protection measures are proposed, including functions such as resource domain classification, boundary security protection, cloud security matrix platform, information data security protection, and terminal security protection.