In 1965, Lotfi. A. Zadeh a professor of electrical engineering with the university Of California at Berkeley, published the first paper on his new theory of fuzzy sets and systems. Since the 1980’s, this mathematical theory of “unsharp amounts “has been applied with great success in many fields. fuzzy sets and its earliest application originated has reminder largely unknown. The history of the theory of fuzzy sets and system and the ways it was first used will be incorporated into the history of 20^th century science and technology.