A method for customizing a security service, comprising: acquiring, by a cloud computing data centre, at least one security service type selected by a tenant, wherein the security service type comprises at least one of the following: security detection service, security protection service, and the security detection service comprises at least one of the following: security scanning service, vulnerability scanning service, webpage scanning service, tamper-proofing scanning service, port scanning service, Trojan scanning service and traffic monitoring service; and the security protection service comprises at least one of the following: password strengthening service, Trojan embedding prevention service, antivirus service, data stream cleaning service and firewall service; and executing, by the cloud computing data centre, at least one security service corresponding to the at least one security service type according to the at least one security service type selected by the tenant; wherein acquiring, by the cloud computing data centre, the at least one security service type selected by the tenant comprises: after receiving a resource list sent by the tenant, determining, by the cloud computing data centre, at least one security service type of a virtual machine tenanted by the tenant, wherein the resource list contains the virtual machine requested to be tenanted by the tenant and a parameter of the virtual machine; providing, by the cloud computing data centre, at least one determined security service type suitable for the virtual machine for the tenant to select according to the parameter of the virtual machine; and receiving, by the cloud computing data centre, information about one or more security service types selected by the tenant. acquiring, by a cloud computing data centre, at least one security service type selected by a tenant, wherein the security service type comprises at least one of the following: security detection service, security protection service, and the security detection service comprises at least one of the following: security scanning service, vulnerability scanning service, webpage scanning service, tamper-proofing scanning service, port scanning service, Trojan scanning service and traffic monitoring service; and the security protection service comprises at least one of the following: password strengthening service, Trojan embedding prevention service, antivirus service, data stream cleaning service and firewall service; and executing, by the cloud computing data centre, at least one security service corresponding to the at least one security service type according to the at least one security service type selected by the tenant; wherein acquiring, by the cloud computing data centre, the at least one security service type selected by the tenant comprises: after receiving a resource list sent by the tenant, determining, by the cloud computing data centre, at least one security service type of a virtual machine tenanted by the tenant, wherein the resource list contains the virtual machine requested to be tenanted by the tenant and a parameter of the virtual machine; providing, by the cloud computing data centre, at least one determined security service type suitable for the virtual machine for the tenant to select according to the parameter of the virtual machine; and receiving, by the cloud computing data centre, information about one or more security service types selected by the tenant. after receiving a resource list sent by the tenant, determining, by the cloud computing data centre, at least one security service type of a virtual machine tenanted by the tenant, wherein the resource list contains the virtual machine requested to be tenanted by the tenant and a parameter of the virtual machine; providing, by the cloud computing data centre, at least one determined security service type suitable for the virtual machine for the tenant to select according to the parameter of the virtual machine; and receiving, by the cloud computing data centre, information about one or more security service types selected by the tenant.