A control method of a virtualized broadband remote access server, characterized in comprising: obtaining a performance parameter of a protocol component in a shared resource pool of a virtualized broadband remote access server; according to the performance parameter, detecting a control operation that satisfies a preset policy; the control operation is used to control the protocol component of the virtualized broadband remote access server; and performing the detected control operation; wherein the control operation comprises a capacity-expanding operation or a capacity-shrinking operation; wherein performing the capacity-expanding operation comprises activating a protocol component that is not added to the shared resource pool, and adding the newly-activated protocol component to the shared resource pool; or performing the capacity-shrinking operation comprises making a portion of protocol components that have already been added to the shared resource pool hibernate, and deleting the hibernating protocol components from the shared resource pool; wherein the performance parameter comprises at least one of a number of users on respective protocol components of all protocol components that have already been added to the shared resource pool, a protocol component network port bandwidth, a utilization rate of a memory of the protocol component, or a utilization rate of a central processing unit, CPU, of the protocol component; and wherein according to the performance parameter, detecting the control operation that satisfies the preset policy comprises: calculating the total number of online users according to the number of users on respective protocol components of all protocol component that have already been added to the shared resource pool; judging whether at least one of the total number of online users, the number of users on the protocol components, the protocol component network port bandwidth, the utilization rate of the memory of the protocol component and the utilization rate of the CPU of the protocol component is greater than an upper threshold of each parameter in the preset policy; and if yes, hitting the capacity-expanding operation; or judging whether the number of users on the protocol component is less than a lower threshold in the preset policy, if yes, hitting the capacity-shrinking operation. obtaining a performance parameter of a protocol component in a shared resource pool of a virtualized broadband remote access server; according to the performance parameter, detecting a control operation that satisfies a preset policy; the control operation is used to control the protocol component of the virtualized broadband remote access server; and performing the detected control operation; wherein the control operation comprises a capacity-expanding operation or a capacity-shrinking operation; wherein performing the capacity-expanding operation comprises activating a protocol component that is not added to the shared resource pool, and adding the newly-activated protocol component to the shared resource pool; or performing the capacity-shrinking operation comprises making a portion of protocol components that have already been added to the shared resource pool hibernate, and deleting the hibernating protocol components from the shared resource pool; wherein the performance parameter comprises at least one of a number of users on respective protocol components of all protocol components that have already been added to the shared resource pool, a protocol component network port bandwidth, a utilization rate of a memory of the protocol component, or a utilization rate of a central processing unit, CPU, of the protocol component; and wherein according to the performance parameter, detecting the control operation that satisfies the preset policy comprises: calculating the total number of online users according to the number of users on respective protocol components of all protocol component that have already been added to the shared resource pool; judging whether at least one of the total number of online users, the number of users on the protocol components, the protocol component network port bandwidth, the utilization rate of the memory of the protocol component and the utilization rate of the CPU of the protocol component is greater than an upper threshold of each parameter in the preset policy; and if yes, hitting the capacity-expanding operation; or judging whether the number of users on the protocol component is less than a lower threshold in the preset policy, if yes, hitting the capacity-shrinking operation. calculating the total number of online users according to the number of users on respective protocol components of all protocol component that have already been added to the shared resource pool; judging whether at least one of the total number of online users, the number of users on the protocol components, the protocol component network port bandwidth, the utilization rate of the memory of the protocol component and the utilization rate of the CPU of the protocol component is greater than an upper threshold of each parameter in the preset policy; and if yes, hitting the capacity-expanding operation; or judging whether the number of users on the protocol component is less than a lower threshold in the preset policy, if yes, hitting the capacity-shrinking operation.