Copyright © 2022 Journal Equity of Law and Governance Page 58 Journal Equity of Law and Governance Vol. 2, No. 1, April 2022, 58-68 P ISSN: 2775-9512 https://www.ejournal.warmadewa.ac.id/index.php/elg The Function of Legal Theory in the Establishment of Regional Regulation of Sustainable Spatial Based on Local Wisdom Made Wiryani madewiryani60@gmail.com Ni Made Jaya Senastri nimadejayasenastri@gmail.com Fakultas Hukum, Universitas Warmadewa Published: 01/04/2022 Wiryani, M. & Senastri, N. M. J. (2022). The Function of Legal Theory in the Establishment of Regional Regulation of Sustainable Spatial Based on Local Wisdom. Journal Equity of Law and Governance, 2(1), 58-68. ABSTRACT - This study aims to analyze the function of legal theory in the regional regulation establishment. Applying a normative legal research method, a conceptual approach to reveal the problem of how the function of legal theory and sustainability principle and also local wisdom in the establishment of regional regulations on spatial planning. The collected legal materials were analyzed by means of the Theory of Legislation, namely the regulation has a legal, sociological, and philosophical basis of validity; The theory of the legal system, namely the characteristics of the law of validity, efficacy, and acceptance and the theory of ecological sustainability which bring together the development and the environment through principles which are contained in adaptive policies. The results of this study show that the function of legal theory in the establishment of a regional regulation is as a basis for formulating substance to comply with legal principles and the function of the principle of sustainability and local wisdom in spatial planning is to ensure protection of the use of space for human life in the present and in the future. Keywords: Legal Theory, Principles of Sustainability, Establishment of Regional Regulations, Spatial Planning, Local Wisdom I. INTRODUCTION The environment, both physical, biological and social, is a basic human need because humans can optimally fulfill their life needs, depending on the environment. The 1945 Constitution of the Republic of Indonesia (hereinafter referred to as UUDNRI 1945) in Article 28H mandates that a good and healthy environment is the basic right of every Indonesian citizen. The idea of good environmental management as an effort to put forth the protection of environment is a consequence of human activities that can have bad consequences and can affect various dimensions of human life and the environment which can be in the form of environmental destruction or pollution. The occurrence of environmental damage is in fact caused more by human behavior who explores natural resources that are only economically oriented without paying attention to the carrying capacity and sustainability of environmental functions for life on this earth. The way of thinking of humans in the modern era is still very pragmatic. The influence of the times and modernization that is currently happening can affect the way humans perceive environmental management. The importance of environmental carrying capacity will be related to the efforts made by the government and society to save the