It has been suggested that the success of an ER project can largely rely on several elements,such as the selection of appropriate materials,establishment of management system,workshop for training teachers. Among those,teachers play an indispensable role due to the fact that it is the teachers who are capable of turning conceptions into actions,who get students engaged and bridge and gap between the goals of the programme and the reality in classroom. This paper is an attempt to outline a detailed picture to demonstrate how to offer effective training courses which can enable teachers to play"multiple roles"to make great contribution to the development of an ER project.