Abstract: Changting County in Fujian Province possesses abundant selenium-enriched land resources, and a comprehensive evaluation of them, based on local conditions is significant for the effective and structured utilization of these resources. Due to the absence of a well-established theoretical framework in existing evaluation systems, the evaluation results are difficult to effectively guide the development of resources. This article is based on the niche theory and comprehensively considers the dominant factors, geographical factors, and limiting factors of selenium-enriched land resource development in Changting County to formulate an evaluation index system. The analytic hierarchy process (AHP) is used to calculate the weight of indicators, and the technique for order preference by similarity to an ideal solution (TOPSIS) method is applied to determine the weighted comprehensive index for comprehensive grading. The evaluation results show that the average selenium content in the soil of Changting County is 0.46mg/kg, and the selenium-enriched soil area reaches 2215.4km², accounting for 71.36% of the total county area, which is mainly distributed in the eastern and western mountainous areas of Changting County. Applying the AHP-TOPSIS model, the selenium-enriched land resources in Changting County are classified into suitable areas, relatively suitable areas, generally suitable areas, and unsuitable areas, with areas of 271.35km², 1116.96km², 1062.07km², and 654.13km², respectively. The suitable areas, relatively suitable areas, and generally suitable areas are approximately consistent with the selenium-enriched areas designated in previous specifications, reflecting the dominant role of soil selenium content in the evaluation index system. The refined zoning results of the original selenium-enriched areas reflect the constraining effect of geographical and limiting factors on the development of selenium-enriched land resources. In the AHP-TOPSIS model based on niche theory, an evaluation index system is constructed with the aim of identifying the optimal niche for the development of selenium-enriched land resources. The evaluation method takes into account the differences in the impact of indicators on the evaluation results and the resource endowment conditions of the evaluation area. The evaluation results reflect the development potential of selenium-enriched land resources in Changting County, effectively improving the science of the evaluation compared to previous standards.