The first-generation Chinese-American composer Chou Wen-chung(1923-2019)devoted his life to integrating traditional and modern,Eastern and Western musical cultures in his compositions.His music is characterized by carefully structured logic and interwoven melodic lines that create a symphonic tapestry of sound.Drawing on the traditional Chinese concept of yin and yang,this paper explores the symmetrical thinking in Chou Wen-chung’s music.It focuses on his self-developed variable modal system to examine how symmetry is reflected in elements such as tempo,meter,note duration,expressive markings,and structural design.The study ultimately demonstrates how Chou's dual cultural identity led him to achieve a convergence between modern Western musical language and Eastern aesthetics through the application of symmetrical thinking.