Scholars seldom study Ci poetry (a type of poetry in ancient China) directly from the perspective of rhyme schemes. The only way to thoroughly figure out the tunes of Ci poetry is to do a completely exhaustive and vertical study of it. We try to start with the traditional structural unit to perform a detailed analysis of every rhyming beat and all verses. After detailed anatomy, we have not only sorted out various problems of the slow tunes in "Xi Qian Ying," for example, the fixed format in this tune of Ci poetry, usage of words, rhyme rules, ping-ze (level and oblique tones), syntax, etc., but also dug out another hidden tonal patterns and rhyme schemes from this Ci poetry. This article provides a deep and comprehensive understanding of the further study on the slow tune of Ci poetry from other aspects. It provides the most accurate reference to the fixed format in the tunes of Ci poetry for current study; on the basis of adhering to the tradition, it gives greater freedom of creation on Ci poetry.