德莱塞的晚期作品《堡垒》超越了自然主义的范畴,阐释了静归中庸的德莱塞。德翁走过了从感悟“适者”到超越“适者”的历程,《堡垒》体现了诸多的中庸情结,堡垒苏伦阐释了道德感与物欲之“中”正,苏伦子女展现了中庸化的结局。《堡垒》所体现的中庸理念,是德莱塞最终归向和谐的内心的真实映照,亦给人类带来安宁的乌托邦之光。 Dreiser’s late fortress, “Fortress,” transcends the scope of naturalism and expounds the Dreiser, which is relegated to moderation. Dion has gone through the journey from feeling “fit” to “surrender” “fit”, “fortress” embodies a lot of moderate complex, fortress Sulun illustrates the sense of morality and materialism , Sulun children show the fate of the middle. The golden mean embodied in “fortress” is the true reflection of Dreiser’s ultimate return to a harmonious inner world and a tranquil utopia for mankind.