The purpose of this study is to explore the underlying forms and formation processes of the syllabic consonants of /l/ and /n/, identify issues of previous studies related to them, and then suggest new approaches based on Harmonic theory. For this, first, we considered the conditions and constraints of syllabic consonants. However, some cases were founded which were not consistent with the syllabic conditions or with the restriction of homorganicity between the syllabic liquids and the preceding consonants. As a result, we suggested two kinds of different underlying forms for the syllabic consonants, /Cl/ and /?C/ on the bases of word structures, acoustic analyses, and articulation. Also, comparing three approaches that were based on Generative, Government, and Prosodic explanations, we found limitations on each of them. Thus, through adopting Level-approach within the theory, we can explain concisely both the fluctuation of the syllabic consonants and complex phonological phenomena caused by adding the suffixes ?ing and ?ily to stems.