This article utilizes a documentary methodology to investigate the changing representations of China in Western missionary ethnographies from the late medieval period to the modern era. The analysis reveals that narratives from the late medieval period displayed a significant degree of openness and interactivity, providing a nuanced depiction of both the societal advantages of China and the challenges it posed for the dissemination of Christianity. However, a significant paradigmatic shift occurred during the pre-modern period. The writings of Mendoza serve as a pertinent example of this transformation, as they romanticized and sanctified the image of China while intentionally omitting references to its societal declines and obstacles to Christian expansion. Furthermore, the subsequent nineteenth and twentieth centuries were marked by an Orientalist discourse that characterized China as a backward and ignorant "Other". In conclusion, this paper clarifies the evolution from a more open and interactive viewpoint to a unidirectional and objectifying perspective in Western missionary literature spanning the 13th to the 20th centuries.