With the popularity of the concept of "green, energy saving, and environmental protection", green buildings have received unprecedented attention in the construction industry. In the construction of green building projects, cost control becomes a key issue. This paper analyzes the cost control problems existing in my country's green building construction. Based on the application of BIM technology, through the management of the whole life cycle of the project, it proposes some effective control measures for the construction cost of green building projects and strives to achieve While saving energy and reducing environmental pollution, the economic effect of saving money is realized. An office building project is used to demonstrate the feasibility and accuracy of the calculation technology, improve the level of refined management of the green building's operating costs, and provide research references for its subsequent dynamic cost forecasting and intelligent cost control.