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With the development of information technology, the information process of power companies is accelerating. Power big data is the product of this information, and its related technologies play an increasingly important role. According to the power big data and related technologies, the visual display technology of power grid planning is also gradually developed. The application of power big data in power grid planning management is analysed and analysed. At the same time, the opportunities and challenges faced by power big data in the development process are analysed. Research provides ideas.

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After the reform of transmission and distribution price, the profit model of power grid enterprises changed, and the composition of profits and costs were affected. The business activities of enterprises changed greatly. Conducting economic activity analysis can strengthen business management, find the crux of corporate problems, and improve operational efficiency. The paper analyzes the impact of the reform of transmission and distribution price on the economic activities of enterprises, and builds an analysis model of economic activities of enterprises based on total profit, main business cost and main business income. The model can provide theoretical support for the analysis of economic activities of power grid enterprises under the situation of electric power reform, and help enterprises to improve management and tap the potential of enterprises, which has certain practical significance.