WSN (wireless sensor network) characteristics including node structure, network topology and communication protocol were fully reviewed while typical precision agriculture WSN applications were specially introduced. Key issues of signal propagation and attenuation modeling, fusion of multiple communication networks as well as lowering senor cost have to be solved considering precision agricultural applications. It is addressed that the combination of WSN technology with other agricultural technologies such as agronomy, agricultural mechanization and automation will be important and supportive to optimize decision support system in precision agriculture development, identify potential problem inside agricultural equipments, promote agricultural management standardization, and minimize energy use and human resource training cost.