Dai Tian’s theory on poetry ecology: Literature is the result of “individual” thoughts and emotions influenced by various external factors, and “individuals” survive in a certain humanistic ecological system. In this deep space-time humanistic network, each poem is a "small ecology" that constitutes the "big ecology". The large ecology of the humanistic environment has influenced the "small ecology" of Dai Tian's works. As for Dai Tian, ??who occupies an important position in the Hong Kong poetry circle, the "small ecology" of his works will inevitably affect the composition and changes of the "big ecology" of the Hong Kong poetry circle.