Through analysis and research on variety of existing wireless sensor networks（ WSNs） cross layer protocol

and put forward a new type of cross layer parameter model. The model gives interaction parameters between various levels of network layer

data link layer

and physical layer in WSNs. Then on this basis

analyze influence of model in network each layer between parameters on network performance. Finally

multiple parameters simulation experiment

derive influence of various parameters on network performance

and carry out theoretical analysis and verify the validity of the model.