There is one free corpus of business English at the Virtual language centre, Hong Kong Polytechnic University. http://vlc.polyu.edu.hk/concordance/WWWConcappE.htm
You may choose it by clicking "select a corpus". But there's little information about the composition of the corpus except some...
Hi, Jiajin, thanks for the news.
It's nice to be able to access SJTU, but rather pitifully the JDEST data cannot be available online. I once read the research on hedges in JDEST in Ken Hyland (1998).