Entanglement not only plays a basic role in quantum theory,[1] but also is a key resource in quantum information processing.[2] The entanglement beyond the microscopic level inspires long-standing interest.It is widely accepted that it should exist,provided that decoherence induced by the environment [3] can be sufficiently suppressed.Generally,experimental proposals for the observation of macroscopic quantum entanglement are often based on the principle of Schr(o)dingers cat.