This paper organized lots of tests in several aspects in outdoor environment by establishing a wireless ad hoc network experiment platform. The relationship between network delivery ratio and the node's transmission was obtained from the measurement of grouping the delivery ratio, which exactly explained the unstable routing behavior in wireless multi-hop environment. Through a large amount of tests, the relationship between delivery rate of network and distance between nodes was obtained. The routing protocol’s inherent problem is analyzed through route changes based on testing software. Finally several solutions to this problem are put forward.