The purpose of this book is to sujjest new definitions of separation axioms in fuzzy bitopological spaces. We study several features of these definitions along with the existing ones. The introduce concepts are less restrictive than those of Kandil and El-Shafee 66,67] as will be found later on. Our criteria for definitions have been preserved as much as possible the relation between the corresponding separation properties for fuzzy topological space. Moreover, it will be seen that the definitions of these axioms are "good extensions" in the sence of 92] due to Lowen. All the definitions are...