As a brand-new development direction of information science domain, Wireless sensor networks(WSN) has caused widespread attention of the academic circles and the industry due to the great promise and the potential with the various applications. WSN consists of a large number of sensor nodes which integrate sensor, the unit for data processing and the module for the short distance wireless communication. The networks is a kind of wireless ad hoc networks with a distinct data-centric property, and the objective of sensor networks is to sense, collect and process the information of the various environments or the detected objects in the coverage area of the networks,and then send the sensing information to the user. At present, WSN has been utilied for the health care, military defense, anti-terrorist,disaster prevention and other commercial area.Along with the the development of wireless sensor network,the network coverage already became the hot spot of the WSN research. it’s of great importance to improve the network performance through enhancing the coverage rate with which the connection is guaranteed in the target area. There are some coverage algorithms in recent coverage rate research works, however these works are based on the unrealistic assumption of perfect coverage.
