"South wind" refers to the wind blowing from the south. Because the wind in the south is usually warmer, it is often associated with warm and soft feelings in poetry. "Xizhou" is the legendary place where immortals live. Because of its beautiful scenery and pleasant climate, it is often used to express the ideal destination or goal in literary works.
This sentence means that the poet connects with the south wind through dreams and expresses his inner feelings and desires. It expresses the yearning and pursuit for the ideal home and pure land of the soul, and is a romantic poem.