Introduction: With rapid growth of population and increase need to social security, construction of comprehensive system of social security is a need and for designing a comprehensive system, it is necessary to study and apply acceptable as well as efficient fundamental principles.

  Literature Review :The social security system has a series of common and particular principles. In some cases the legal system of Iran has failed to reconcile social security system with the tenets of social security and there are many defects in this area. The main purpose of this article has been the critical study of the application of the governing principles of social security in Iran's law.

  Conclusion: Iranian Social Security System has faced with major challenges which lead to increase of poverty, unemployment and decrease of productivity and finally based on the results, hardly, there is achievement of social security principles.