The propositional Lagic Structure is su logical properties are discussed. DifSerent forms of fuzzy propositional expressions are investigated. Simplifications and conversions between logical expressions are investigated; exact equality and approximate of these conversions are discussed. The logical structure of intuitionistic (mo-sided) fuzzy sets are studied in the framework of fuzzy propositional algebra..* This approach still has a limitation, because in real life a flower can be 100% beautifid and 0% ugly; another flower can be 80% beaut33 but still not ugly at all (0% rature of a process can be defined as high with 80% trutR value but low with 10% truth value. 0-7803-3645-3/96 $5.0001996 IEEE