Chinese poet who strove to loosen Chinese poetry from its traditional forms and to reshape it under the influences of Western poetry and the vernacular Chinese language.

After graduating from Peking University, Xu went to the United States in 1918 to study economics and political science. While there, he changed his courtesy name to Zhimo. In 1920 he received an M.A. in political science from Columbia University in New York City and then traveled to England to study at the University of Cambridge, where he became fascinated with English Romantic poetry and decided upon a literary career.

Returning to China in 1922, Xu began writing poems and essays in the vernacular style. He fell under the influence of the Indian poet Rabindranath Tagore (Tagore, Rabindranath) while serving as interpreter for him during a lecture tour of China. The foreign literature to which Xu had been exposed shaped his own poetry and helped establish him as a leader in the modern Chinese poetry movement. He served as an editor (1925–26) of the literary supplement of the Chenbao (“Morning Post”)—the most important literary supplement in Beijing at that time—and as a professor of literature and law at various universities. In 1927 he helped organize the Xinyue Shudian (Crescent Moon Book Company), and the following year he began editing Xinyue (“Crescent Moon”), a literary monthly featuring liberal ideas and Western literature.

Xu was killed in a plane crash. In addition to four collections of verse, he produced several volumes of translations from many languages.