The portrait of Kong Yiji was depicted in the novel Kong Yiji through a series of descriptions. One of the most important forms of expression was the description of one's appearance. Kong Yiji's short, ugly, and fat face had an unbreakable smile on it. He was wearing a tattered coat and hat, his hair was sparse and messy, and his body was emitting a musty smell and alcohol. These descriptions directly revealed Kong Yiji's identity and social status, reflecting his characteristics as a low-class figure. Secondly, Kong Yiji's language and behavior were also expressed through a series of descriptions. He spoke slowly and his pronunciation was unclear. He often used some profound terms to pretend to be a cultured person. His attitude was arrogant and he ignored the guests. Sometimes, he even showed some sarcasm and ridicule. These descriptions of language and behavior revealed Kong Yiji's character, showing his lack of compassion and humanity. Finally, Kong Yiji's story also expressed his character image through side descriptions. Through the dialogue, actions and psychological descriptions of other characters, the novel reflects Kong Yiji's situation and feelings, showing his image as a weak person. At the same time, through Kong Yiji's confession and reflection, the novel also reveals his inner pain and struggle, reflecting his side as a thoughtful person. To sum up, Kong Yiji's portrait used many methods to express his character image, including appearance, language and behavior, as well as the side description of the story, so as to deeply reveal his image as a low-class figure and the weak, as well as the pain and struggle in the depths of his heart.