The current paper raises concerns about the differences of the markedness of passive voice between English and Chinese from the perspective of the prototype-model theory. The active voice of both English and Chinese is unmarked due to their tendency towards nature and agreement with the order of events, while the passive voice of both appears marked on account of their emphasis on results, ignorance of the agent, and violation of the sequence of events, resulting in the prototype of both languages. The application of English voices is related to styles, in which the English styles of science and technology with objectivity tend to employ the passive voice and be unmarked thus. Literature in English endowed with strong subjectivity is marked owing to less passive voice. Voices and styles do not have this association in Chinese, in which passive sentences are less applied and tend to be more marked. As such, markedness theory analysis applied in second language acquisition contributes to predicting acquisition orders in English and Chinese passive sentences and guiding teachers to develop instructional plans reasonably and effectively.