Abstract: In this paper, using the weather yield index (low) which shows the influence on the grain producing, a study on the I_(DW) feature in space and time and its relationship with climatic condition during 1949～1988 in Shanxi is obtained. The following chatacters are found: The range and amplitude of I_(DW) get larger. I_(DW) correlates with precipitation closely but weakly and negatively with temperature. It is the essential factor restricting the grain producing that the climatic precipitation is smaller than the agriculture's need. I_(DW) in some areas correlate oppositely with others as a result of this reason the grain yield has been compensated each other in Shanxi. It is an advantage which make up for the shortcoming of climate. The department concerned should pay great attention to these change and feature in climate and I_(DW).

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