“ This Study is an effort to explore intensively the nature of the Islamic state during the Era of prophet Muhammad (PBUH) and his pious caliphs from ,Hijri :1 to Hijri : 40 .the original and complete thesis was more voluminous than the recent one, the Original Manuscript consisted of three volumes including 2500 pages .so after discussion with supervisor and other advisors . This study as suggested in the synopsis included one introduction, with five chapters and single conclusion; on the other hand the complete manuscript contains one voluminous introduction and four sub-chapters in the each chapter of written manuscript. So the decision was taken that the main introduction should be summarized from the 250 pages to 15-20 pages, the Sub- introductions were also discarded from the chapters two, four and five respectively. Therefore applied and practical discourses regarding politics, state, administration, Economics, law, Constitution and Welfare state has been researched in depth. The major difference between the other studies and This research is that the present thesis is written by the political scientist, not by any historian and religious scholar. We see that Majority of Research Scholars, especially pertaining to social sciences does not give importance to the quality of data(in Islamic frame work),in reality they mostly rely over historical data with already self-created dogmas and perceptions, data without any authenticity and narrators, and one may find that if narrators are cited somewhere , no importance is given to the fact that what is his/her status in term of “ the science of Biography (name and records of narrators /Asma –ul-rajal)? The truth, sincerity, level of memorization, character, piousness is not given importance, continuance of chain of narrators is not deemed seriously, strong narrations are replaced by weak narrations .So I tried my level best with my limited resources to first give importance to the Quran and Sunnah as primary sources. Traditions of the prophet (PBUH)) have been given prevalence over traditional chainless historical sources. I tried My level best to utilize authentic tradition’s (Ahadith-e-saheeha) and good tradition (Ahadith-e-hasna) as a major reference in this study, its depend on the availability of data pertaining to the discourse under my research Frame Work, this study reflects that Islamic state is not an utopia or myth but in reality it not only used to exist but also used to function .and it was so ultimate and perfect, in term of reality, that she might be a role model for the present Muslim states with their desire of establishing true Islamic state in their territories . First This study not only presents broad and enhanced dimension of Islamic State of early era of Islam, but also provides fountain of compilation of a narration from the narrators, pertaining to politics and administration. in term of theory and practice , second this study provides detailed narrated information regarding Macroeconomics ,means of revenues ,policies and their fair practical implementations. Third the subchapters of law and constitution of respective era , not only provides detailed information regarding sources of Islamic law and constitution , but also they provide real insight regarding Islamic criminal law and legal criminal decision taken by prophets (PBUH) and his pious caliphs (khulfa-erashdeen) or their governmental judges. Fourth the sub-chapters of welfare state in their respective era covers the hypothesis that the Islamic state used to function as welfare state, it provides narrations by narrators to validate the authenticity of data. Fifth Study also differentiates itself from present modern welfare states, this whole study covers the hypothesis that in Islam state is not mean itself but just a mean to achieve destiny, sixth it focuses that there is no concept of separation of religion from politics, in Islamic doctrine politics is an integrated part of the Islamic system of practices. Seven It also defines the hypothesis that Islam not only has his own conception and system of human rights that is spiritual by nature of revelation , but also Islam has his own doctrine of rights of Allah (huqooq _ul-allah ) and rights of devotees ( huqooq –ul-ibad). All the rights have been granted by Allah to human beings, conclusion covers two hypotheses respectively, it differentiates the difference between the western concept of human rights and Islamic concept of rights of god and rights of devotees in light of Quran and Sunnah or western philosophy. The conclusion is that Islamic state is neither a utopia nor a fable, in reality, it used to exist, in the Real History Of the World ,and she functioned so perfectly and accurately that it may be enforced in current situation by considering a state of medina as a role model for present Muslim states.