The integration of a unified data model (SG-CIM) is crucial for the effective management of data in power grid systems. However, the lack of a graphical design tool tailored to the specific needs of the State Grid Corporation (SG) poses significant challenges in the collaborative design and efficient application of the SG-CIM. This paper proposes the development of a graphical design tool for SG-CIM, which aims to enhance model design efficiency, reduce the workload of designers, and improve the overall quality of the model. The tool incorporates semantic distance algorithms and recommendation systems to facilitate intelligent model design, automating repetitive tasks like searching, matching, and identifying elements. The proposed tool also supports collaborative design across different levels of the organization and enhances the usability and flexibility of SG-CIM in real-world applications.