Abstract: By using monthly mean geothermal, precipitation and mean temperature of the depth of 0-20cm during 1961 to 2009 at Dezhou meteorological station, the variation of average shallow geothermal and the relationship between geothermal and precipitation as well as mean temperature were analyzed. The decadal variation of sequence elements is filtered with 9.2 times of smoothing techniques, demonstrating the trend. The results showed that the mean shallow geothermal in each season increased with the rate of 0.22～0.485℃ per 10 years, maximum in spring and autumn, minimum in summer. Annual mean shallow geothermal in each layer from 1960s to the middle of 1990s was the cold periods, and in the late 1990s was the warm period. The main reasons of impact on geothermal increasing were the increasing temperature and the decreasing precipitation. The results could provide a reference to utilizing climatic resources and adjusting planting division and distribution of agricultural production.

Key words: Shallow geothermal, Climate trend rate, Geothermal abnormal