Abstract:In order to improve the accuracy and effectiveness of construction project cost accounting and adapt to the dynamic changing characteristics of construction projects, this article takes dynamic budget management as the starting point, deeply analyzes its mechanism in cost accounting, and constructs a complete construction project cost accounting system based on dynamic budget management. This system is based on real-time data collection and analysis, relying on advanced algorithm models to accurately predict and monitor the costs of each stage of the project. Through information technology, efficient data transmission and sharing are achieved, ensuring that all parties involved timely grasp the cost dynamics.