<p>Changbaishan Global Geopark possesses unique and rare geoheritage, yet it has seldom been objectively and systematically evaluated. The Analytic Hierarchy Process (AHP) is commonly utilized in geosite evaluations. However, during the application of AHP for geosite assessment, challenges arise due to fuzzy evaluation indexes, uncertainty, and multi-factor interactions, making it arduous to quantitatively and accurately evaluate geosites. The integration of fuzzy theory can effectively address the issue of fuzzy evaluation indexes, yielding quantitative and precise outcomes. Hence, this study focuses on Changbaishan Global Geopark, employing the Fuzzy Analytic Hierarchy Process (FAHP) to establish the geosite evaluation index system based on scientific value, educational value, and touristic value. Subsequently, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) method is utilized for calculating and ranking the comprehensive evaluation scores. Finally, according the calculation results and the "Chinese Geoheritage Investigation Code", the significance of the geosites are categorized. The results reveal that among the 20 geosites in Changbaishan Global Geopark, 5 hold global significance, 5 have national significance, 7 possess provincial significance, and 3 exhibit local significance. Compared with the traditional method of evaluating geosite, the method used in this study focuses more on evaluation criteria and can calculate the significance of geosite more clearly and objectively. The results of this study indicate the importance level of each geosite, aiding decision-makers in geoheritage conservation management planning. Furthermore, conservation recommendations are provided to enhance geological conservation, geotourism, and sustainable development of Changbaishan Global Geopark.</p>