Under the context of promoting the ecological civilization construction in the new era, ensuring the green socioeconomic development of regions, and achieving the goal of "carbon peaking and carbon neutrality" as scheduled, it is of great significance to carry out multi-scenario territorial spatial optimization simulation research could be supported by low-carbon development based on the classification and restrict of main functional areas. Two different development scenarios for the natural development and low-carbon development were set by taking Fujian Province, the national pilot zone for ecological conservation, as the research area. Differentiated carbon emissions, economic benefits and ecological benefit constraint and targets were set for various types of main functional areas. Based on the prediction of land use demand, the multi-scenario territorial spatial division optimization simulation was carried out by taking advantage of PLUS model. The results show that:(1) From the perspective of land use scale and quantity structure, the land use structure of functional areas under low-carbon development could better cater the requirements of low-carbon economic development. The low-carbon development scenario can reduce the reduction rate of carbon sink while lowering the growth rate of carbon sources, and lower carbon emissions and the impact on the ecological environment besides meeting the land demand for regional economic development; (2) In terms of land use layout, certain differences do exist in land use structure under different scenarios. However, from the view of spatial distribution characteristics, the changing laws of various lands are basically the same as the previous trends. The carbon source is mainly distributed on the side near the coastline with low altitudes and gentle terrain, which is easy to be developed, and the carbon sink is mainly concentrated in the inland areas with relatively high altitudes and complex terrain; (3) From the perspective of three types of typical regional spatial evolution patterns, the changes in agricultural production areas and ecological protection areas are few, in comparison to the significant changes of urban construction areas. The main functional lands in urban construction areas and agricultural production areas are more concentrated, with a high degree of aggregation. The main functional lands in the ecological reserve scatter and are under fragmented status. Under different development scenarios, the carbon source in the spatial pattern expands continuously while carbon sink space decreases subtly. It is necessary to further explore the potential of stock land, with a view to promoting the efficiency of land resource use.