Abstract
DSC has played an important role in many fields. Since temperature modulated DSC (TMDSC) was developed 15 years ago, many researchers and engineers have published the papers with the advantage of TMDSC as an analytical tool. This paper introduces new 3 topics of application of DSC and TMDSC as follows; thermoporosimetry about the electrolytes membranes of polymer electrolyte fuel cell(PEFC), cooperative rearranging region(CRR) for unified understanding of the glass transition and rigid amorphous as the intermediate state between crystal and amorphous states. The bright prospects for the future will be expected in these topics.