## 2 Theoretical Analysis and Research Framework  
According to the concept of satisfaction, subjective satisfaction is often the subjective feeling generated by comparing one's own expectations of a certain thing with reality [18; 23]. For example, [PERSON] et al. [24] investigated the satisfaction of farmers with adopting new superior varieties. [PERSON] et al. [25] determined how farm-level factors affect farmers' satisfaction with their work and quality of life. In recent years, satisfaction evaluation has extended from initial customer satisfaction to other diverse fields [19; 24; 26; 27]. For example, [PERSON] et al. [28] explored farmers' satisfaction with drip irrigation technology. Other previous studies have evaluated agricultural policies from a satisfaction perspective [29; 30]. For example, [PERSON] et al. [31] investigated the satisfaction of farmers with land consolidation policies in Turkey's Adana and Mersin Provinces. [PERSON] et al. [32] examined the impacts of the compensation amount and payment methods on the satisfaction of Chinese farmers with farmland expropriation compensation. The effectiveness of policy implementation largely depends on the skillful advocacy of the government and the resulting social acceptance. Satisfying the majority of the public is an evaluation indicator of policy results [16]. Policy satisfaction based on self-evaluation has strong explanatory power for some economic behavior intentions and decisions of farmers [33]. Therefore, to a certain extent, policy satisfaction, as the most direct subjective evaluation of agricultural policies by farmers, reflects the effectiveness of policy implementation and the degree of impact on farmers. Agricultural policy practice has realized historic successes, achieving a transformation from traditional agriculture to modern agriculture, from promoting rural economic development to strengthening rural social construction, from increasing farmers' economic interests to safeguarding farmers' democratic rights, and from breaking the urban-rural dual structure to promoting urban-rural integration and development. Previous studies have found that agricultural subsidies have a significant positive impact on the subjective initiative of farmers to grow grain, and farmers' satisfaction with agricultural subsidy policies will directly affect the effectiveness and sustainability of the implementation of these policies [34]. From this, it can be seen that the adjustment and optimization of the agricultural policy structure in different periods have achieved agricultural development goals in different stages, for which the policy structure is the key foundation. Policy synergy is an effective way to solve multiple conflicting or competing policy objectives by optimizing the policy structure to maximize the effectiveness of policy implementation [35; 36]. There may be different standards and implementation processes for different types of agricultural policies targeting the same goal. Theoretical analysis suggests that the policy structure can also affect farmers' satisfaction with GPPs. Based on the preceding analysis, the following hypothesis is proposed. **H1. **_The policy structure has a significant impact on farmers' satisfaction with GPPs._  
In policy practice, in addition to formulating scientific and reasonable policies, the effectiveness of policy implementation is crucial [37]. Policy implementation is a key link in achieving policy goals and an important method for testing the scientific nature of policy formulation [38]. The evaluation of policy implementation effectiveness has also drawn the attention of the academic community. For example, [PERSON] et al. [39] used the difference-in-differences method to assess the impacts of ecological compensation policies on the Poyang Lake basin. Explaining the success or failure of current public policy implementation based on classical theories and models is the mainstream paradigm for current research on policy implementation [40].