20世纪30年代,尽管婚姻自由已经广为城市中的青年男女接受,但恋爱至上的原则不仅冲击了传统伦理道德,也影响到了小家庭制度。通过“叶案”可以看出,传统伦理道德依然具有广泛的社会基础,以“非婚”为归宿的自由恋爱并不能得到社会认可。 Although the freedom of marriage was widely accepted by young men and women in cities in the 1930s, the principle of supremacy of love not only affected traditional ethics but also affected the system of small families. Through the “leaf case”, we can see that traditional ethics still have a wide range of social foundation. Free love, which is based on “non-marriage ”, can not get social recognition.