  The interest in text to speech synthesis increased in the world .text to
speech have been developed formany popular languages such as English, Spanish
and French and many researches and developmentshave been applied to those
languages. Persian on the other hand, has been given little attentioncompared
to other languages of similar importance and the research in Persian is still
in its infancy.Persian language possess many difficulty and exceptions that
increase complexity of text to speechsystems. For example: short vowels is
absent in written text or existence of homograph words. in thispaper we propose
a new method for persian text to phonetic that base on pronunciations by
analogy inwords, semantic relations and grammatical rules for finding proper
phonetic. Keywords:PbA, text to speech, Persian language, FPbA
