The principle of ‘rule of law’ in Muslim countries follows the epistemological foundation of theocracy and is classified under the model of legal rationalists. Implementing the plan of development from the eighteenth century in Muslim country has caused the pragmatism to affect the process of implementation of Sharia in Muslim countries gradually and changed the foundation of the principle of rule of law. In the present study, we have shown that the evolution based on the epistemological effect of pragmatism is founded on the epistemic basis of theocracy in implementing Sharia. The abovementioned effect has appeared first in the civil law and then in the public law and the theory of the state. Accordingly, implementing Sharia has faced a non-foundational attitude and its model has shifted from traditional natural law to modern natural law. The result of this change is giving principality to the human-like rationality in creating the legal rule. Supporting private ownership, human rights and civil rights are among the consequences of the effect of pragmatism in creating the legal rule. The epistemological effect of pragmatism is evaluable in the level of philosophy of law in the Muslims countries. Thus, the pragmatic approach considers the law as a type of perceptions of the practical intellect, and its epistemological foundation is on transition from Kant’s transcendental intellect and making use of instrumental intellect.