Field information collecting device has the problems of high energy consumption, high cost, unable to conduct fixed and mobile collecting field information simultaneously. In order to solve these problems, a new type of agricultural information service system was designed. It is composed of three parts: ZigBee wireless sensor modules with the functions of acquiring information from farmland; mobile terminals base on DSP and ARM9 with the function of passing the field information to the agricultural producers; WebGIS agricultural information management system with the function of guiding the policy-makers for decision-making. Finally, the experiment was carried out and some explanations and indications were given to the problems of the system that need to be improved.