Abstract: The Jiyang Depression, a secondary tectonic unit of the Bohai Bay Basin, is characterized by an elevated regional heat-flow regime associated with lithospheric extension and possesses considerable potential for hot dry rock (HDR) geothermal resources. Radiogenic heat production within sedimentary strata constitutes an important component of surface heat flow and plays a critical role in controlling the deep geothermal field and geothermal resource potential. However, the spatial distribution of radiogenic heat production in the Jiyang Depression remains poorly constrained owing to the limited availability of heat-production data, and its contribution to the deep geothermal field has yet to be quantitatively evaluated. In this study, 46 core samples across different stratigraphic horizons and with multiple lithologies were systematically collected for testing and analysis of radiogenic heat production rates(A). Combined with natural gamma ray(GR) logging data, a regional empirical GR-A conversion relationship was established, a regional stratigraphic heat production column was constructed, and the thermal contribution of radiogenic heat production in sedimentary layers was quantitatively simulated. The study shows that the average radiogenic heat production rate of sedimentary layers in the Jiyang Depression is 1.40 μW/m³, with a standard deviation of ±1.25 μW/m³. Its spatial distribution is controlled by stratigraphic lithological associations and diagenesis: The radiogenic heat production rate of clastic rocks increases with the increase in argillaceous content and compaction degree; carbonate rocks generally have low heat production rates (average < 0.5 μW/m³) due to the depletion of radioactive elements but high thermal conductivity; Archean strata, rich in acidic magmatic rocks such as granite and migmatitic granite, have both the highest heat production rate (average 2.31 μW/m³) and relatively high thermal conductivity (2.78 W/(m·℃)), forming a “high heat production - strong thermal conductivity” advantageous combination and thus becoming the preferential target horizon for HDR development. Through quantitative simulation analysis of heat flow contribution, the radiogenic heat production of sedimentary strata in the uplift area reaches 30.5 mW/m², accounting for 37.2% of the surface heat flow, which significantly affects the deep geothermal field. This study reveals the controlling factors and thermal contributions of stratigraphic heat production rates in the Jiyang Depression, providing basic data on lithology-thermophysical property coupling for deep resource exploration, and is of great significance for geothermal resource exploration and development in other secondary tectonic units of the Bohai Bay Basin.