It will zoom into the real economy crisis, the credit derivatives market, extended to the global financial markets, and accelerate the spread of the crisis: the crisis of the real economy has been amplified and accelerated credit derivatives, CDO's depreciation for the first transmission and the entire credit derivatives market turmoil, the investment of such derivative securities hedge funds began to shrink dramatically and then, the issue of derivatives and derivatives of company stock management began to fall, which in turn caused investors to the company's general financial concerns, and thus may lead to financial market turbulence. financial market turbulence could then in turn worsen the real economy, thus creating a vicious cycle and lead to real economic recession.