This research aims at investigating U.S. subprime mortgage crisis’s influences on the degree of Taiwan company’s exchange rate exposing risks and discussing the cross-sectional factors that affected the degree of Taiwan company’s exchange rate exposing risks. Research results showed that during the crisis in 2008, companies that had positive foreign exchange exposing risks were impacted the most and only while facing NT dollar depreciation and significant changes in the exchange rate company then showed negative foreign exchange exposing risk. The multiple regression analysis on foreign exchange exposing risk's decisive factors discovered that company scale was the major factor that affected company's foreign exchange exposing risks, regardless for positive exposing risk or negative exposing risks. Big company's foreign exchange exposing risks were significantly smaller than small company. Finally, during the crisis, the increase of foreign exchange exposing risk significantly increased company's individual risks.