Creation of Multimodal ESP Network Teaching Platform via IM

Based on the multimodal discourse analysis theory and constructivist learning theory,the paper embarks from the ESP professional English teaching and explores the advantage,creating background,theoretical basis,realization path and the design of the IM multimodal network teaching platform,coming to the conclusion that IM( instant messaging) software is not only the physical tool of interactive communication,but embodies the spirit of win-win cooperation and sharing with people.