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Abstract: This paper disscusses the regional service effect of the current supervising information system of rice in China according to about one thousand AGROMETEOROLOGICAL FORMS OF RICE NO: 1. It is proved that the information provided by the current system can be used in information forecasting service within provinces in south China, only if the growing period cofficients, the tillering and earing ability cofficients, and the yielding cofficients of varifies are introduced by taking the difference among the growing period of varities, their tillering and producting ability into accont, and the regions and the types of planting are classed according to climatic featuer. The effect is good. It is also proved that the precision of the current method for yielding analysis is low, and this affects its service quality. Observing precision and the service quality of the system can be improved if sampling number can be determind by density variance and proper sampling method is used.

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