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WIA-PA is an emerging industrial wireless sensor network protocol. This paper proposes a kind of design and implementation method for the farmland temperature and humidity sensor network based on WIA-PA protocol. The layers of the protocol are built on the basis of the principle of hierarchical state machine. And WIA-PA uses the QP (Quantum Platform) programming platform as a hub of task scheduling. Star network and mesh network are combined to form the self-organized wireless network by the temperature and humidity sensor nodes, and the sensor information will be gathered to the gateway node. In addition, the system is designed to be with low power consumption. And the interaction between the gateway and the server has also been achieved by an agreement. What’s more, the power consumption of the sensor network and the packet loss rate are measured, and the design is proved to be effective and reliable.