This article is made up of two parts; The first part is on the definition and the domain of Islamic economics.The author has, in this part, tried to give an analysis and criticize of definitions given by Islamic economists. In the last analysis, the author states his own views. Finally in his opinion economics is also in part, a study on civilization and the human society which is defined as follows: "The study of individual and social behavior of man in relation to the use of resources in the direction of satisfying the material goals of man" The author is against the adding of Islamic stipulations to economics, and at the same time he believes that this science comprises part of what God has ordered us to learn in this world, in order to understand His divine providence.On such basis, the domain of economics, if it is to be redefined according to the Islamic point of view, is stated as follows: "Man's behavior in all its aspects and under any kind of ethical and religious value system and within any social and political and legal framework".The second part is on the subject of methodology, and answers the question that whether the Islamic economics calls for a special methodology, or whether as a comprehensive economics, it will accept the West' s scientific methods in economics and its general frameworks.The author, in this part, differentiates between the Islamic economic system and economics, and continues in two pivots: - The method of exploitation of an Islamic economic system.- The Islamic methodology of economics.From this point of view, the economic system is made up of three elements; Islamic philosophy or ideology, basic premises and the executive laws.Islamic economists must discover all the comprising elements of the system, in the shape of a concrete and manageable whole. The method of discovery is similar to that used in discovering theories and general rules in jurisprudence, some of which can be found clearly in the Holy Koran and the Tradition, and some others must be deduced from the collection of verses and narrations on various fields.About the Islamic methodology of economics, the author believes that: 1. In spite of the general of economical laws, their discovery is a process affected by the values held by the researchers themselv~s, as well as the social circumstances and the ethical schools of the social units.Islamic economists must recognize the effects of value systems on economics and differentiate between the two.2. The second duty of Islamic economists is to integrate the basic premises taken from religion into the positive economics.3. In the implementation of the above duties it is necessary to differentiate between the presumptions which are affected by the values held and the tools which are much less affected in the same way.4. In cleansing the laws of economics from non-Islamic values, and integrating Islamic values into economics and thus enriching economics and with the non-value basic premises taken from revelation, Islamic economists are obliged to redefine and correct a number of basic definitions of the theory of economics, but they do not need to reject the inductive method and the tools used for analysis of economical theories.