Propose a cost analysis and optimization model for power grid technical renovation projects based on standardized processes. Firstly, a standardized sample data splitting process has been established to improve data splitting efficiency; The second is to unify the caliber of data reporting and introduce data verification rules to improve the quality of data splitting; Thirdly, based on cost analysis requirements, a digital management solution based on standardized processes has been proposed. The optimized cost analysis mode significantly improve the efficiency and quality of cost analysis work for power grid technical renovation projects.