An embodiment of the present invention provides a resource management method for a virtual machine system, where the method includes: obtaining, by a virtual resource management platform, a QoS constraint parameter of a virtual machine cluster and a current operating status statistical indicator of the virtual machine cluster, and according to the QoS constraint parameter of the virtual machine cluster and the current operating status statistical indicator of the virtual machine cluster, adjusting physical resources scheduling policy of a physical device platform or performing physical resource scheduling on the physical device platform. The method may ensure QoS of a cloud application.