The transit water resources are the important source of water for social and economic development in the areas along the Yangtze River. The quantitative determination of the influences of transit water resources on the carrying capacity of water resources in the areas along the Yangtze River provides a basis for formulating the utilization policies of their water resources, and it plays an important role in guaranteeing the stable and satisfactory development of their society and economy. A model for calculating the carrying capacity of water resources based on water consumption is established. The carrying capacities of water resources in Nanjing City considering transit water resources in 2015 and 2030 as well as those based on the local water resources are calculated, respectively. The influences of transit water resources on the carrying capacity of water resources in Nanjing City are also analyzed. The results show that under the increasing demand of social development, the influences of the current transit water resources on the carrying capacity of water resources in Nanjing City in 2015 are 0. 51. However, with the development of society and economy, the influences of the transit water resources on the carrying capacity of water resources in Nanjing City will increase to 0. 59 in 2030.