The formation mechanism of the spatial pattern of tourism complexes in Sanya City was discussed under the dual drive of capital and resources. By in-depth analysis of the roles of various factors such as fixed capital investment, resource endowment, market driving and government promotion, their impacts on the spatial pattern of tourism complexes in Sanya City were discussed. It is found that although fixed capital investment and resource endowment have no significant direct impact on the spatial pattern of tourism complexes, they indirectly exert an impact through their effects on physical space and social and cultural space. Market driving and government promotion have a negative regulatory effect in this process. Market driving may lead to investment biased towards short-term interests, and if government promotion is improperly planned, it will also affect the rational allocation of resources. Further research shows that strengthening market mechanisms and optimizing government functions are crucial for promoting the scientific and reasonable formation of the spatial pattern of tourism complexes in Sanya City.