Abstract: In the context of achieving China′s carbon peaking and carbon neutrality goals, it is a focus problem to continuously promote the rapid transformation of large-scale construction projects such as underground cavern group to low-carbon and green directions.In order to ensure the rational allocation of construction resources of underground cavern group and realize green and low-carbon construction, an index named “carbon entropy” was proposed in this paper to measure the uniformity of carbon emissions during construction.With “resource entropy” as a measure index of resource balance, a resource balance optimization model considering carbon emissions and resource supporting construction was established, and an interior point algorithm was designed to solve it.On this basis, a dynamic resource optimization process considering construction schedule delay was constructed to ensure that resource allocation can be optimized and adjusted in time after risk events.This model application in Wudongde Hydropower Station showed the model was accurate and effective, which can improve the overall balance of resources, reduce the peak value of resource input and carbon emission during the construction period, and improve the efficiency of resource allocation.