Cloud computing technology,as an emerging computing model,is gradually becoming one of the key technologies in the field of computer security storage.The article elaborates on the basic concept of cloud comput-ing,explores its advantages in improving data security,availability and scalability,and proposes its applications in computer security storage,including data encryption and privacy protection,storage virtualization,resource optimi-zation,etc.,in order to provide useful references for future technological development and security strategy formula-tion.