Abstract:NIE Yin-niang’s marriage to the mirror maker cannot be judged as the opposition to the feudal marriage system. And her remarriage to the governor CHEN Xu did not mean her escape from the darkness and cross over to the brightness. The novel highlights the nicety through the contrast between knight-errant and immortals and it makes an attempt to persuade people to practice Taoism to become immortals. Its value of thoughts is that it reflects the life experience of a knight-errant relatively integrally, especially his tragic fate. Meanwhile, it reveals the root of his decadence. Further, it shows the differences between a knight-errant and a assassinator. This provides people a standard to distinguish a knight-errant an assassinator.