From a psycholinguistic perspective, Kellerman suggested that L1 transfer is determined by learners' perception of the distance between the native language and the target language (psychotypology), and learners' perception of certain L1 rules or items in terms of language specificity/neutrality (psychotypicality). Apart from the two factors, however, L2 learners' proficiency in the target language may also affect L1 transfer. 80 non-English first-year undergraduates participated and a language proficiency test and two questionnaires were employed in the study to investigate the influences of Chinese on English learning. The results showed that the Chinese EFL learners' perception of the specificity of Chinese topic-prominent structures, English proficiency, and the interaction between the two factors all significantly affected the transferability of the Chinese topic-prominent structures to their acquisition of the English subject-prominent structures. In contrast, no statistically significant effect was found for learners' perception of Chinese-English distance.