Abstract: To address the requirements for the long-distance transportation of nuclear steam supply from pressurized water reactors, three steam parameter improvement technologies were proposed, including electric heating, steam compression, and hybrid heating. Thermodynamic design and economic analysis were conducted for a 40 km steam transmission scenario. Results show that within the nuclear power plant, using an electric heater to reheat the steam to 290 ℃ can maintain a superheat degree of 12 K at the end of the steam pipeline, with the lowest cost increment per ton of steam at only 15.19 RMB. Installing two-stage steam compression in the heating network ensures superheated steam transportation, but the system equipment investment is high, increasing the cost by 29.34 RMB per ton. For the hybrid heating technology, mixing with 28% mass fraction of high-priced thermal power steam leads to a cost increase of 33.96 RMB per ton of externally supplied steam, accompanied by significant system fluctuations. Considering technical maturity, economic efficiency, and operational stability, the in-plant electric heating technology is the optimal solution for breaking through the bottlenecks in the long-distance transmission of nuclear steam supply.