After the goal of carbon neutrality was proposed, plant landscape planning and design have ushered in a new opportunity and challenge. This study focuses on the functions of garden plants to reduce the source and increase the sink of carbon emissions, sorts out and summarizes the existing research through documentary analysis, and puts forward suggestions of plant landscape construction mode through the whole design process， including (1) at the micro level, we should pay attention to the selection of age and type of plant materials; (2) in the medium view, we discussed how to reduce carbon emissions and enhance the carbon sink from garden plant community planting, vertical planting, carbon sequestration in water; (3) from a macro perspective, we should pay attention to how to consider the connection between gardens and surrounding green spaces from the perspective of planning to promote urban carbon sink function. Based on field research in Haidian Park and taking the typical plant landscape as an example, we analyze and discuss the defects and provide suggestions for plant landscape design, which provide references and foundations for the establishment of a multi-dimensional low-carbon plant landscape model suitable for the northern urban parks.