Computer simulations are currently essential way to research and develop wireless sensor networks (WSN) protocols

rather than deploying high-cost test-beds. However

simulation results rely on physical layer assumptions，which are not accurate enough to capture the real behavior of WSN. So modeling the propagation characterization is very important for simulation

especially for the resource constrained of WSN. Most of the applications for WSN consider the nodes to be at ground level. However

there is a lack of radio propagation characterization by measurements. In this paper

we measured the path loss model of the near-ground propagation in suburban

and useful model parameters are provided by linearity regression. In addition

we also measured the irregularity of radio propagation near ground

and analysis the impact on wireless sensor networks.