The global warming caused by the increasing carbon emission has become more and more serious, leading to seriously natural disasters and economic losses. This unbalanced development has prompted lots of countries to explore the low-carbon development model. In order to understand the land use structure which is good for decreasing carbon emission, this paper takes Shenzhen as a study area. Combining the current land use structure in 2020 and the land use policy, the quantitative structure of each land use type in 2020 under the scenarios of maximizing carbon sink and minimizing carbon emissions is estimated. And the FLUS (Future Land-Use Simulation) is used to simulate the spatial distribution characteristics of land use types in Shenzhen under these two scenarios. Finally, comparing the low-carbon benefits of the two scenarios from the perspective of carbon density and carbon emissions. The results are as follows:(1) the total carbon surplus of land use under the scenarios of maximizing carbon sinks and minimizing carbon emissions is less than that in 2020, and the total carbon surplus of land use under the scenarios of maximizing carbon sinks is the largest. Under the scenarios of maximizing carbon sinks, the area of cultivated land, garden land and forest land increases while water and construction land decreases. The increase in the area of garden land and forest land under the scenarios of minimizing carbon emissions comes from the reduction of grassland, water and construction land. The carbon in these two low-carbon scenarios increased sink capacity and reduced carbon emissions. (2) Under the scenarios of maximizing carbon sinks and minimizing carbon emissions, forest land increases significantly so that the total carbon surplus of land use is smaller than that of 2020. The difference between the two low-carbon scenarios is mainly grassland and garden land. Under the scenario of maximizing carbon sinks and minimizing carbon emissions, the western and southeastern regions are mainly the areas with increased carbon density and reduced carbon emissions, while the central region is the areas with reduced carbon density and increased carbon emissions. Therefore, the key regulation of the central region is conducive to the realization of carbon neutrality and carbon peak in Shenzhen. It can provide planning advice for low carbon development in Shenzhen and other regions.