Modern Poetry's horizon of expectation means how people think of the prior knowledge of modern poetry. Zhang Mo was hailed as a leading voice of the ”new poetry” movement. His anthologies and poetics set standards of good poems, which greatly influence the formation of ”horizon of expectation”. Poems compiled by Zhang Mo are all around the history of modern poetry and his anthologies arouse great interest of the Taiwanese poetic group. His anthologies have an effect on how readers take the horizon of expectation and therefore establish the model of Taiwanese modern poetry. As for his poetics, it is practical. It tells readers how to tell a good poem. A good poem should on the one hand reflect one's life on its theme and on the other hand focus on the forms of artistic expression in its language. Therefore by observing the pattern of Zhang's anthologies and poetics, we easily get his ideas to poetry.