This paper would like to find out the real causes of recent United States subprime
mortgage market disorder from the point of global 100 years` politico-cultural cycle, 50 years` medium-term techno-managerial cycle. and 20 years` short-medium-term construction cycle. Then, scrutinize the causes, e.g. mortgage market`s bubble caused by Federal Reserves` easy money policy, financial deregulations stemmed from Reagan Administration in due course of globalisation, together with the wasty Afghanistan-Iraqi War, and finally high risk and high return subprime mortgage market with lack of financial discipline and inappropriate financial supervision system, etc. As a conclusion, this paper extends some policy countermeasures.

