Abstract: To build a low-carbon park is an important part of carbon neutrality. At present, the park is still in a planned and intermittent energy-saving stage to avoid wasting electric energy, which is difficult to promote the consumption of renewable energy and the low-carbon transformation of the power system. This paper proposes a normalized low-carbon operation scheme for the park based on green power index. First, the evaluation index of the green power index is proposed based on the simultaneous rate of park load and renewable energy output. As a result, the low-carbon benefits of energy-saving behaviors in each period are quantitatively evaluated. Then, the elastic model of these loads is established considering two kinds of loads with interruptible and energy storage characteristics, respectively, and the load is grouped based on elastic clustering and probability distribution. Finally, the optimization model of low-carbon operation for the park is proposed based on green power index to realize the park's normalized low-carbon operation through fine-grained regulation. The measured data of buildings in a park in Shanghai are taken to perform the simulation, and the results show that the proposed operation scheme can achieve carbon reduction for the park, and promote the consumption of renewable energy as well as the normalization and sustainable carbon reduction in the park effectively. Besides, it also provides richer flexibility for power grids.