High heat- producing granite is one of the important intracrustal heat sources is widely distributed in the southeastern China, which provides the possibility of superficial heat generation and accumulation in the region. Based on the distribution of granite resources in the region, this paper systematically analyzes the radiogenic heat production characteristics of the main granite bodies in the region, and makes a comparative analysis of the deep temperature distribution, geothermal heat flux and crustal heat structure in the key geothermal exploration areas with the deep drilling of geothermal exploration in the region in recent years, and proposes a heat gathering model of shallow surface geothermal resources in the study area. The analysis concluded that the southeastern China has a quadratic heat gathering pattern of “mantle source heat supply- intracrustal heat generation- fracture heat transfer- cover heat preservation”, among which, the radiogenic heat production rate of granite is one of the main factors affecting the shallow geothermal field in the area. The heat production rate of the North Guangdong- South Jiangxi rock body is obviously higher than that of the granite body in Zhangzhou area, which in turn is similar to the thermal structure of lithosphere of “hot crust- cold mantle” or “warm crust- warm mantle” type but has some differences with that of “hot mantle- cold crust” type in Zhangzhou. The fracture structure and cover conditions have obvious control on subsurface heat accumulation and dissipation. The results of the study are of theoretical and guiding significance for the in- depth understanding of the genesis and heat control factors of geothermal resources in southeastern China, as well as the future exploration and development practice of geothermal resources in the region.