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This invention relates to the field of manufacturing electrode materials for thermal batteries, specifically a method for preparing gold-doped sulfide materials. The invention employs a low-temperature hydrothermal method to construct a doped framework, forming a uniform and complete micron- and / or nano-scale Au dopant on the framework. Then, a sulfur-addition process is used to achieve a more stable embedding of the dopant within the FeS2 particles, resulting in excellent thermal stability and high effective discharge capacity when the product is used as a thermal battery. The product obtained by this invention has a discharge specific capacity greater than or equal to 361 mAh / g and an internal resistance less than or equal to 0.102 Ω. The process of this invention is simple and controllable, and the resulting product has excellent performance, facilitating industrial application.