Based on the experimental results of the thermal springs, the earthquakes, the structures, the distribution of magmatite and the thermal breaks, this paper states the characteristics of the geotherm field and discusses the relations between block movement and the Geotherm-Earthquake in Fujian, Guangdong and Jiangxi regions. The result of this study shows that the block differentiation actions are very strong in the regions since the Yanshan movement, it is closely related to the two important thermal stage actions (90 million to 120 million years from now and 157 million to 165 million years from now)in crustal deep. Modern thermal field is mainly the result of the geothermal stage action which continued to develop in Mesozoic Era. It is found that the front peak of magmatic action in Fujian-Guangdong tectonic zone had become Weak and backed obviously from ocean to inland in Cenozoic Era. But there remain the characteristics of block structure that cold block and thermal block alternated from northeast to southwest. The stronger the activities, the more remarkable the Geotherm-Earthquake Effect, and there was the characteristic that the activities gradually became stronger and stronger from inland to Taiwan.
Analysing the ratio that the Geotherm-Earthquake energy in south Fujian-north Cuangdong block was depleted and disperred, we found that each of the blocks has specific DEPLETING-DISPERSING STRUCTURE, which is the thoroughfare that energy is transmitted and changed between the lower crust and upper mantle. It depends mainly on the foundation heat flow in upper mantle and the lateral nonuniformity. The energy flow of the Geotherm-Earthquake fakes about 2% of the geothermal flow of the ground.
Applying the equifinal principle, we study the problem that tectonic force and thermal stress act unitedly on the preparation of intraplate earthquake and the breaking mechanism, and put forward that the end points and inflection points of the rhombic block circumference are the favourable locations, which cause easily thermal break. Therefore, it is possible that Manson-Coffin effect causes the thermal fatigue of the depth rock and elastic breakearthquake. Thus it may be inferred that to study the Geotherm-Earthquake structure is a new subject which has the theoretical and practical significance.