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The paper analyzes the variation characteristics of energy fields of seismicity 2. 1≤ML≤4. 5 in Jiangsu and its neighboring areas during the period between January 1970 and December 2007. It also analyzes the variations of time "weight" coefficients of the major typical energy fields, using random function theory with seismic energy fields as a space-time random function field based on Empirical Orthogonal Function (EOF) expansion methods. The results show that the expansion accuracy of the first seven typical fields is 0. 9244. The strength of seismic energy varies remarkably in different tectonic blocks in the study area. High value areas are in middle and southern Jiangsu, and the south Yellow Sea. The distribution of the typical fields also shows that it is an area that affects most significantly the seismic energy fields of the study region. The time "weight" coefficients of the first six typical fields vary with time, and the amplitude of the variations has strong temporal correlations with moderate-strong earthquakes in the region.