Fan Yi played an important role in Thunderstorm. She is not only an important connection point of this intertwined network, but also the key to promoting stories and conflicts. In the play, she is a woman who loves and hates clearly, dares to love casually and hates violence. Her behavior is often bold and rebellious, although she often makes some crazy and selfish moves, but this thunderstorm-like character is the expression of her true temperament and the embodiment of thunderstorm itself.

Fan Yi is uneasy about "three obedience and four virtues". With a new education, she loves poetry and is wild. Her innate wildness and stormy personality gave her the courage to break through the feudal shackles and made her a feudal rebel. It is this woman with thunderstorm personality who dares to pursue herself under the suppression of feudal ethics and shouts, "My heart, I am still mine."

Fan Yi's contempt and challenge to feudal etiquette is mainly reflected in her struggle with Zhou Puyuan, the representative of feudal autocracy. "I am responsible for what I have done. Unlike your grandfather, granduncle and your good father, I did many terrible things secretly. The society outside still has moral faces, philanthropists and good people. " "Your father is the first hypocrite!" In the dialogue with her, she denounced the hypocrisy and sin of Zhou's feudal system, exposed her deep hatred for respectable capitalists and lamented her painful marriage life.

Cao Yu once said that when he wrote Thunderstorm, he didn't think of correcting or criticizing anything. At that time, only a few people attracted him, especially the Leng Yan woman Fan Yi. Thus, Fan Yi is one of the important creative motives for the publication of Cao Yu's Thunderstorm. This Leng Yan Fan Yi is the most shocking figure in Cao Yu's works. As an advanced female representative during the May 4th Movement, she yearned for freedom and pursued the liberation of personality, which was of progressive significance to the times at that time and called for the awakening of female consciousness. Although she is in a lifeless and bored dark cage, her pursuit of personality liberation is extreme and abnormal. What she can't get is not available to others, and this surly character is also an important reason for her tragedy and death.

Fan Yi is a new female representative with new ideas. Although the May 4th new ideological trend was fierce enough to shock people, it came and went quickly. In such a rapid wave of new ideas, these women who are eager to accept new ideas simply have no time to take the essence and discard the dross. Under the influence of deep-rooted feudal thoughts, they were forced to live in old and new ideological forms and pursue their own happiness. However, where the old and new concepts are difficult to reconcile, it is not enough to achieve integration, breakthrough and development by our own strength. The conflict between feudal thoughts and ways of doing things in the old days and the pursuit of freedom and individual liberation in the new era makes Fan Yi a contradiction. The contradiction in this era is insoluble, which means that it is difficult for Fan Yi, an old woman with new ideas, to get rid of her doomed fate. Fan Yi's tragic fate is completely predictable. This duckweed-like woman finally ended her wandering life on that thunderstorm night-a night of destruction. Finally, after losing freedom, love and children, she lost herself and became a crazy woman in the attic in the eyes of future generations …