Wireless monitoring networks has large amount of node’s.Single node’s data quantity is not very large but transmit periodically or paroxysmal.Meanwhile

it has a high requirement on the accuracy of data network

coverage range and power consumption.Because of these features

traditional anti-collision method can’t solve collision problems.A more flexible and high efficient method

called conditional polling

is designed and implemented.In a conditional polling applied wireless monitoring networks

experimental tests show that conditional polling method is better than traditional method.