Abstract: The age of shallow groundwater in Shenyang-Fushun section of Hunhe River Basin is calculated with ³H isotopic method. Through the age zoning of groundwater and analysis of its circulation characteristics, the paper provides a scientific basis for the rational development and utilization of groundwater resources and study on carrying capacity of urban resources and environment. The results show that the groundwater in the Shenyang-Fushun section is mainly the modern water replenished in the past 60 years, and the age of groundwater flow increases gradually from the eastern mountainous area to the western plain. The distribution area of groundwater aged less than 30 a, 30-60 a and more than 60 a account for 34%, 31% and 35% of the total of the study area, respectively. The upper reaches of the basin are hilly and mountainous area, with single aquifer structure, coarse particles, groundwater age less than 30 a and strong groundwater circulation. The aquifer in the middle reaches thickens gradually, the alternation of groundwater circulation weakens gradually, and the groundwater age increases to 30-60 a. The aquifer in the lower reaches gradually changes from single layer to double layer and multilayer, with fine particles and slow water circulation, and the groundwater age increases to more than 60 a.