The fuzzy gray matter-element space theory (FHW) , founded in 1980s by Professor He Zhongxiong, is a theoretical method which is about soft science decision supporting to solve the problems of making decision and forecasting in the large scale complex systems. Based on Delphi method, it combines the BS and K. J methods together and synthesizes several theories including fuzzy mathematics, gray system and metterelement analysis. The soft science decision supporting system on the basis of the FHW theory has achieved a lot in the practical application. For nearly 20 years, this kind of theoretical method has got its own long-term development and improvement by the integration of other subjects such as artificial intelligence, complex system and set theory. This paper briefly introduces the FHW theory system, practical application and development in the recent years.