Abstract: In farmland information collection system which based on the wireless sensor networks, effective deployment of nodes becomes one of the research priorities, due to the is large number of sensor nodes laid in wide area of farmland. NS2 software executed the simulation comparison from the following aspects such as packet loss rate, average delay, the remaining energy of sensor nodes. The hexagonal plan was determined as the final deployment one, and experiments were carried out in the fields. Results showed that the system could achieve seamless coverage, and acquire the field information stably and reliably, which laid the solid foundation for further application infield wireless sensor networks.