In this paper, past stem of a number of Persian verbs which seem to be irregular have been investigated in OT theory based on Persian phonotactics. The research questions include: 1) How Persian phonotactics rules are applied to analyze past stems' segment sequences? 2) What phonological processes are applicable to preserve Persian phonotactics patterns after adding past morpheme? To answer these questions, 36 verbs which their final syllables are heavy (cv:cc) are taken into consideration according to syllable structure and phonotactics. In sum, the findings demonstrated that: a) these cases are completely regular and entirely consistent with the Persian phonotactic rules; b)there is a close relation between the nucleus of thec v:cc syllables and their final cluster; c) initial and final consonants play an indispensable role in cv:cc syllable and d)these stems obey sound sonority principle (SSP).

Keywords: syllable, morpho phonemics, past morpheme, phonotactic, Sonority, final cluster

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