During the Republic of China(1912-1949),Zhongshan Roads rapidly emerged in major cities and towns across the country,and hundreds of them remain today,primarily in affluent areas.To investigate this uncommon road-naming phenomenon,a comprehensive study was conducted on their construction process and spatio-temporal characteristics(within the scope of county-level and above administrative regions),using toponymy,historical geography,and GIS.Historical documents and maps were re-examined,combined with data from the China National Geographical Name Information Database,OpenStreetMap,and Historical GIS techniques such as spatial measurement,spatial analysis,and visualization.The results showed that:(1)Zhongshan Roads were initially named to commemorate Dr.Sun Yat-sen.During the Republic of China era,599 Zhongshan Roads were established,primarily in Taiwan,Henan,Shaanxi,and along the southeast coast.(2)Today,there are 653 Zhongshan Roads,except in Xizang,Hong Kong,and Macao.(3)Among these,the Zhongshan Highway in Taiwan is the longest,while Zhongshan Street in Emei township,Hsinchu county,is the shortest.Tainan has the largest number of Zhongshan Roads overall,whereas Shanghai's Huangpu district has the highest concentration and density of these roads across China.(4)Spatial analysis revealed that historically,Zhongshan Roads were mostly found in the centers of old cities and towns.However,since the founding of the People's Republic of China in 1949,new Zhongshan Roads have gradually moved away from city centers.(5)Over the past century,there have been four significant periods of road-naming popularity:following Dr.Sun Yat-sen's passing,commemorating the Victory of the Anti-Japanese War and the recovery of lost territories,restoring place names altered during the 1966-1976 period in the 1980s,and naming new roads at the start of the 21st century.Zhongshan Road,with its century-old tradition,symbolizes the collective remembrance of Dr.Sun Yat-sen and his enduring legacy among the Chinese people.It also reflects China's pursuit of modernization and national rejuvenation in modern times.The data analysis in this paper may require partial refinement as more historical materials are unearthed and quantitative methods are updated,but it does not affect the overall conclusions.