Climate change poses a great threat to life. In order to reduce the impact of climate change, we need to take actions to reduce the amount of greenhouse gases in the atmosphere. This paper focuses on how to design a forest value model to optimize the arrangement of plant planting cycles and harvesting cycles, and then design the forest value evaluation model. And the robustness and sensitivity analysis of the model are tested, and the model performs stably. Besides, Using AHP to evaluate the target, we find the data of the secondary evaluation indicators and calculate its weight with Entropy Weight Method, which makes the model more objective and reliable.