Abstract: In large-scale farmland wireless sensor network (WSN) applications, how to select the optimum network architecture and corresponding self-organization model is the problem which should be resolved urgently. Based on multi-hop and wireless self-organization Ad Hoc networks, and inspired from the biological organization mechanism of growth and cooperation along large numbers of cells, a hierarchical WSN topology was proposed, which integrated star network with mesh network, and cluster head cycle-switching schemes were also proposed. Inner-cluster management was used to reduce long distance signaling exchange between sensor nodes and base stations, network setup complexity and cost of network routing and data processing.