本文使用雙變量DCC-TGARCH模型探討七大工業國(G7)與非七大工業國(非G7)的價值型投資組合、成長型投資組合、大公司、小公司隨時間變動的系統風險及這些投資組合對大盤指數報酬是否存在抗跌性。研究時間由1993年1月1日至2010年12月31日,並以亞洲金融風暴、網路泡沫化、金融海嘯三個危機點加入探討。研究結果發現,G7與非G7國家的價值型投資組合、成長型投資組合、大公司、小公司皆存在波動不對稱現象。再者,在G7國家中顯示成長型投資組合較價值型投資組合具有抗跌性,而小公司較大公司具有抗跌性;非G7國家方面則是價值型投資組合較成長型投資組合具有抗跌性,而小公司較大公司具有抗跌性。最後,當金融危機發生時,在G7國家中僅有日本的成長型投資組合與小公司具有抗跌性;非G7方面,僅有馬來西亞的價值型投資組合與小公司、台灣的價值型投資組合、香港的價值型投資組合及大公司、泰國的大公司具有抗跌性。 This study uses DCC-GARCH model to examine time variation in systematic risk and defensive characteristics for value, growth, big and small portfolios in G7 and in non-G7stock markets. The study period is from January 1, 1993 to December 31, 2010. Moreover, this study focuses on the impact of Asian financial crisis, the Internet bubble and the financial tsunami to explore systematic risk and defensive characteristics. The result indicates that value, growth, big and small portfolios exist asymmetric volatility. The growth portfolio has more defensive than value portfolio and small portfolio has more defensive than big portfolio in G7 and in non-G7stock markets. Finally, growth and small portfolios in Japan have defensive characteristics in G7 stock markets when the financial crisis happened. As for non-G7 stock markets, only value and small portfolios in Malaysia, value portfolios in Taiwan, value and large portfolios in Hong Kong and big portfolios in Thailand have defensive characteristics.