Focusing on the tunes of ci-poetry, this article is an attempt to analyze the lyrical types and expressions of the beginning of the second stanza of a poem (guopian 過片) in long tunes (changdiao 長調). The first task is to give a clear definition to guopian. In the Song dynasty, the term referred to the first phrase or paragraph of the second stanza of a ci-poem. Since the Ming and Qing dynasties, however, guopian was instead called "change of the head"(huantou 換頭). In addition, the lyrical type of a guopian was determined by the attributes of the tune-title. According to the manner of emotional expression, the structure of a guopian can be divided into two categories, namely loop structure and linear structure. The former refers to the guopian that functions as integration, condensation, or transition of the emotion expressed in the preceding stanza. It forms a kind of aesthetic effect of fluent rhythms. The latter, linear structure, refers to one that usually divides the two stanzas in a poem and thereby forms a coherent narrative flow. This was a new mode of changdiao poems in the Southern Song, which catered to the needs of the different milieus of lyricism.