This paper focuses on the "war imagination and horrors" writing of Taiwan writers in the modernism generation, discusses how the modern writers dealt with the" war trauma that the first generation of postwar could not face, and from the perspective of subjective reality outlines human circumstances and choices in war scenes and frames . This paper studies the texts of Bai Xian-yong (白先勇), Li Yu(李渝), Wang Wen-hsing(王文興), and Guo Sung-fen(郭松棻) regarding war subjects. Although most of the modern writers had no war experience, they intended to describe the Chinese Civil War by using their imagination and created the other side of true war history which was different from the selective interpretation of war history by the government. Moreover, their works presented some issues regarding the violent essence of wars, people's hurts from wars and solders' guilt after wars. The key point of these works is not to reap-pear the objective history, but to present the subjective reality. On the one hand, they presented the evil’s writing for the need of human integrity. On the other hand, they reflected the guilt of the postwar first generation caused by the Chinese Civil War, and made the catharsis like tragedies do for readers. Finally, based on the human circumstances created according to the war history, they brought up many ethical issues that people would face under extreme situations, and created an innovative way of dialectics between Taiwan history and literature.