恩格斯一八八八年四月《致玛·哈克奈斯》的信,是马克思主义文艺理论的重要文献.书信通过对哈克奈斯的《城市姑娘》的评论,深刻地阐述了现实主义基本原则,并以巴尔扎克为例,说明现实主义的真实描写,可以违背作者的见解,取得“现实主义的伟大胜利”.恩格斯的这个论断在今天仍有重要的意义. Engels’s letter to Mahakneas in April 1888 was an important document in the Marxist theory of literature and art. The epistles profoundly expounded realism through comments on Hackney’s “City Girl” The basic principle and taking Balzac as an example to illustrate the true description of realism, we can violate the author’s opinion and obtain “the great victory of realism.” This conclusion of Engels still has important significance today.