The composition of the cost of the mine project is discussed in detail, the main factors affecting the cost are systematically analyzed, and the estimation method of total cost and cost items according to calculation, calculation and analogy prediction methods are proposed, which provides a basic basis for the establishment and cost estimation of the cost bank. The cost database, cost estimation model and cost index analysis model have been developed, a cost estimation system integrating query, estimation and analysis has been built, the centralized storage and online query of scattered cost data have been realized, the rapid estimation of the cost cost of the proposed project has been realized, and a certain region and specific students have been realized. Online analysis of cost indicators under the condition of production scale. The cost bank, cost estimation model and cost index analysis model are independent and interrelated.It provides the basis for the preliminary cost estimation and production and operation cost prediction of the mine project, provides accurate data for the pre evaluation, in-process evaluation and post evaluation of the project, provides a scientific and effective judgment basis for the rationality of the cost level, improves the work efficiency of the mine project cost estimation, improves the professionalism and scientificity of the technical and economic work, and provides strong support for the enterprise decision-making, Provide a strong guarantee for the development of digital economy in the industry.