Abstract: In recent years, with the continuous expansion of China′s power system, the power grid inevitably bears the risk of major power outages. In order to improve the power supply capability of important loads under extreme situations such as large-scale disasters, this article takes Suzhou power grid as an example for research, which has high scale and importance in China. Combining the actual situation of users, sources and grid structure in Suzhou, the article proposes constructing a "grid-generation-load" linkage Suzhou characteristic strong power grid, which takes important users in the region as the starting point, a strong grid structure as the goal, ensuring power supply as the support, and emergency power supply as the supplement. The strong power grid provides an economical and reliable solution for differentiation construction of strong local power grids, and proposes corresponding strengthening needs for the planning and construction of power grid projects. The construction of the strong local power grid is conducive to promoting the transformation from power grid disaster prevention and resistance towards "active defense", supporting the high-quality development of China′s power industry, and ensuring national security and social stability.