The evaluation of the biodiversity strategy adopted by the Green Deal is critical to assess its effectiveness in achieving environmental objectives. The European Green Deal emphasises the importance of biodiversity conservation, while the Natura 2000 policy aims to protect or restore habitats and species in EU Member States. However, more comprehensive evaluation frameworks are needed to measure the impact of these policies on biodiversity conservation. The study addresses policy evaluation across the Green Deal and emphasises the importance of developing a systemic approach in this area. The paper considers the appropriateness of policy review and its specific role in the public sector by policy triangle. The framework covers the four key aspects of policy. The Policy analysis triangle consists of four elements: context, content, process and actors for who participates in and influences formulation and implementation of the policy. Green Deals focusing on biodiversity show promise for innovation and specific achievements towards nature and biodiversity objectives. By aligning policy objectives with monitoring mechanisms and stakeholder engagement, the effectiveness of biodiversity strategies under the Green Deal can be further enhanced and the long-term success of environmental protection efforts can be ensured.