Abstract: An objective understanding of the trade-offs and synergistic relationships inherent to ecosystem services within the Beijing-Tianjin Wind and Sand Source Management Project Area is essential for the optimization of ecosystem services and the effective management of the ecosystem. Based on InVEST, RWEQ and other models, six ecosystem services such as habitat quality, food supply, water yield, carbon storage, soil conservation, windbreak and sand fixation, etc. were calculated from 2000 to 2020 in the Beijing-Tianjin wind and sand source management project area to explore the characteristics of the spatial and temporal patterns of various ecosystem services; the correlation coefficient method and ecosystem services trade-off degree method were used to explore the trade-offs and synergistic relationships of ecosystem services during the same period of time. The results showed that: 1) Food supply, soil conservation, carbon storage, and windbreak and sand fixation services show a spatial pattern of high in the southeast and low in the northwest; from 2000 to 2020, all of these ecosystem services show a significant increasing trend, but habitat quality as a whole decreases significantly. 2) Based on the results of the two kinds of trade-off and synergy calculations, it was found that the three groups of windbreak and sand fixation-food supply, water production-carbon storage, and windbreak and sand fixation-water production were dominated by a synergistic relationship; habitat quality was related to wind control and sand production respectively. Habitat quality has a trade-off relationship with the five groups of windbreaks and sand fixation, soil conservation, carbon storage, water production, and food supply. 3) Consistency analysis of the results of the two methods showed that the synergistic areas of the two groups of water production-carbon storage and windbreak and sand fixation-food supply overlapped more, accounting for more than 53% of the whole region, and the areas were concentrated in the Ulanqab Plateau and Xilingol Plateau sub-regions; The trade-off areas of the habitat quality-food supply overlap more, accounting for 27.57 per cent of the region. In order to maintain the sustainability of regional ecosystems, it is recommended that future ecological construction should be identified in the future ecological construction process, taking into account the trade-offs and synergies between ecosystem services in different regions, as well as ecosystem conservation and utilization objectives.