Recent research indicates that English medium education in Hong Kong, even in schools with very able students, is not helping students to achieve the level of second language proficiency that both theory and the experience of other countries suggest is possible. The study reported in this paper aimed to identify the contribution that teacher education can make to improving the quality of English medium education in Hong Kong. The paper takes into account the recent developments in the Hong Kong Government's medium of instruction policy. The study investigated the specialised language oriented teacher education needs of English medium secondary teachers of content subjects in Hong Kong in connection with the further development of a teacher education programme in the Hong Kong Institute of Education. The study is based within immersion education theory of which English medium education in Hong Kong is seen as a variant. This proposes that students can acquire a very high level of proficiency in the second language through the use of the language as the medium of learning for content subjects across the curriculum. Research in other educational contexts suggests a variety of qualities which teachers may need but none relate to the specific context of Hong Kong. The unusual characteristics of immersion education in Hong Kong area very high proportion of students undertaking English medium education by international standards (even with the recent changes in government policy), teachers with varying levels of second language proficiency and students with very varying levels of motivation to learn in this way. Although some research exists within Hong Kong on this topic it is incomplete and inconclusive. It was, therefore, necessary to bring together research from overseas and Hong Kong within this one study. In addition, questionnaires were administered to teachers, interviews were held with teachers and lessons observed in schools. The analysis produced a framework consisting