Introduction: The absence of legal certainty in arranging the regional eco-partnership results in the lack of maximum realization of sustainable development by the regional government partners in Surakarta City, Indonesia. This research analyzes the concept of the legal policy on the environment-based eco-partnership realizing sustainable development. Methods: This legal research employed a doctrinal approach. The type of research is descriptive. It is to explain the research object, namely the regional partnership policy in Surakarta City. Results and Discussion: The policy concept offered in this research is based on the identification process by looking for root causes that affect the non-realization of partnerships that accommodate the principles of sustainable development in Surakarta. It uses several indicators, namely: (1) Partners of Surakarta City government; (2) regulation; (3) society, which are described as the small bones. Meanwhile, the big bones are the analysis results of the root problems from the three indicators, i.e. the non-realization of eco-partnerships. As a comparison, the Philippine Ecological Management Act of 2000 has fully decentralized its implementation. It mandates the 3R policy: Reduce, Reuse, and Recycling. It sets a target of at least a 25% diversion rate among local governments. Malaysia formulated the New Economic Model to cement its commitment to pursue sustainable development based on high income, inclusivity, and sustainability Conclusion: Therefore, the Surakarta City Government needs to reformulate the regional regulation on the partnership by integrating economic, social, and environmental aspects into the partnership policy (eco-partnership) as an effort to achieve sustainable development.