Night is the last novel of Ba Jin, which represents the highest artistic achievement of Ba Jin's novel creation. The artistic achievements are as follows: first, the characterization is more abundant; The second is the change of artistic style and creative method; Third, the expansion and deepening of themes and themes; Fourth, the development and factors of creative thinking, the author writes truly, delicately and profoundly. Through the description of the repeated collision of two psychological factors in the characters' hearts, the inner pain of the characters is very touching.