Tehran metropolis for many reasons including location type, inadequate physical development, lack of observance of balanced development and alignment of land, failure to observe the precautionary principle in environmental issues as a preventive principal, and. . . always subject to the risks of natural hazards The population density is the main cause of existential and environmental problems in Tehran. Including threats that threaten Tehran, impending earthquakes and environmental problems. of course, with the possible earthquake in Tehran, and despite the population density in the capital, which is 19 times the national average, the damage rate and casualties resulting from it can lead to a human disaster. Therefore, the application of legal principles can be an effective solution for the most The above-described problems. By implementing the existing laws on the topic of de localisation of Tehran, including: (balanced development and land testing in the framework of the principle of equality, the implementation of e-government in the framework of the principle of compliance, the reduction of government in the light of paragraph 10 of the third principle of the Constitution, the realization of welfare state means Real in the framework of the principle of legitimate expectation, serious efforts to reduce the damage caused by possible earthquakes and environmental problems in Tehran in the light of the application of the precautionary principle, etc. ) can greatly overcome the major problems of this city. In the present study, we intend to provide a legal perspective to provide solutions to reduce the potential damage caused by these natural hazards. The research method is descriptive-analytical and applied.