The financial supervision defects of U.S.were exposed during the period of the financial crisis. The current financial supervision system produced several surface of longstanding defect,including mainly racetothebottom regulation and legislation competition,unmatched between the divided supervision and mixbusiness,disproportion of the financial supervision,and deficiency of the systematic risk supervision. These surface of longstanding defect didn’t produce in short time,but accumulated in the longtime financial development process,and based on the origin of political instructor,economical theory and legal tradition. The financial supervision defect is the origin and destination of financial reform of U.S.. Facing squarely to the financial supervision defect,and carrying reform on financial reality,are the bases of the effectiveness of financial supervision reform.