Katherine Anne Porter is a famous American novelist in the 20th century. With superb writing skills and a unique literary style, she has become a recognized literary stylist in American literary circles. Porter is not a prolific writer, but her works are excellent, which gain the attention and praise of critics. Most of her works are related to her own life experiences and the real life, so literary critics have always defined her works as realism literature, but some of her works are rich in the features of modernism. This thesis taking Porter's famous novelettes Noon Wine and Pale Horse, Pale Rider as the research objects, discusses symbolism in her works, and strives to enrich readers' understanding of Porter's works. It is no longer limited to realism and understands the features of symbolism contained in Porter's works.