Abstract This article analyzes the socioeconomic image of China developed in the sixteenth and seventeenth centuries by Spanish travelers and historians, differentiating between the idealized “Iberian view” and the more nuanced and critical Jesuit perspective. What were thought to be the main reasons behind China's wealth that impressed Europeans so much is relevant for a better understanding of the seventeenth-century debate on the causes of the decline of Castile, the heart of the Spanish Empire. On the one hand, the contrast between the increasingly battered Hispanic monarchy and the image of prosperity—more or less nuanced—conveyed by both visions of China made clearer the situation of socioeconomic decline of the Spanish Empire. In fact, from both visions could be implicitly derived diverse criticisms of the Spain of the last Habsburgs. On the other hand, it is paradoxical and surprising that the protagonists of the debate on the Castilian decline, the arbitristas, were not aware of the writings on China of their contemporaries, which reduced the potential of their analysis.