Individual differences are widely regarded as significant variables in the success of foreign language acquisition, especially language learning motivation, strategies, and autonomy. Additionally, the study abroad context is also understood as an important factor for the promotion of language learning success. However, individual differences studies in a study abroad context, where English is not used as target language but as lingua franca or medium of instruction, have been very rare, particularly in terms of Chinese participants.The aim of this dissertation was to investigate the characteristics of Chinese students in Hungary regarding their individual differences in learning English, specifically in term of their strategy use, motivation types, autonomous learning behaviors, and language contact; the correlations of ID variables with genders, degree levels, lengths of study abroad, majors, and proficiency; as well as cause-effect relationships between IDs with English learning efforts and perceived English proficiency; along with dynamic changes of motivation and strategy use before and after coming to study abroad in Hungary. Quantitative and qualitative methods were respectively utilized to answer different research questions. 160 Chinese participants at Hungarian universities were investigated by using a questionnaire survey and 12 participants were interviewed. By means of different statistical analyses along with content analysis, the main findings revealed that: (1) Chinese students in Hungary showed very strong motivation, especially in information medium, displayed more frequent use of direct learning strategies, exhibited high levels of autonomous learning behaviors, as well as higher access to media contact. (2) Some differences were found between different genders, lengths of study abroad, academic majors, degree levels in terms of different scales of the ID variables. (3) Significant correlations existed not only amongst ID variables, but also between ID factors with efforts as well as proficiency; in particular, the strongest correlations existed between efforts with information medium and social responsibility. (4) Information medium and autonomous learning behaviors in academic settings turned out to be the significant contributors to predict English learning efforts; however, autonomous learning behaviors and language contact function as significant contributors influencing English proficiency. (5) There were indeed fluctuations in English learning motivation, changes in English learning strategies, and variation in English learning autonomy because of the change of learning contexts from home to study abroad.