鲁迅一生撰写了大量的回忆性文字，怀念的对象涉及他人生中的各个不同阶段所遇见的各类人物，其中有老师、朋友、弟子与家人等，却唯独对于自己的嫡亲祖父周福清“不着一字”。本文认为由于祖父科场案引致了鲁迅早年的一系列不幸与屈辱，所以鲁迅一直是在有意地回避。文章由此深入地探讨了鲁迅与祖父在思想文化观念、立身行事原则与文学审美情趣等诸方面的差异。在结尾处则试图运用弗洛伊德的精神分析学说探究鲁迅这样做的深层心理动因，从而揭示出，鲁迅以此独特的自我防御机制来实现“无意识的有意遗忘”，并借以达成他与过去的彻底告别。

 Lu Xun wrote many reminiscences about his life, which concern all kinds of people whom he met at different life stages, including teachers, friends, disciples and family, but he wrote “not a single word” about his grandfather Zhou Fuqing. This essays holds that Lu Xun has been deliberately evading the issue of his grandfather’s imperial examination because it had led to a series of misfortunes and humiliations in Lu Xun’s early years. This essay further probes into the differences between Lu Xun and his grandfather in terms of ideological and cultural concepts, code of conduct, literary and aesthetic taste, and so on. In the end, the essay attempts to use Freud’s psychoanalysis to explore the deep psychological motivation of Lu Xun’s doing, and reveals that Lu Xun used his unique defense mechanism to realize “unconscious intentional oblivion” and bid complete farewell to the past.