Enterprises must take cost control actions to gain advantages in the fierce market competition. Therefore, if enterprises want to achieve sustained and stable development and make contributions to the steady and rapid development of the economy, they must make deeper adjustments to the cost control to improve the profit space. The economic environment on which the traditional cost control depends has begun to die out, and the deficiencies of its theories and methods have become increasingly prominent. The development of cost control is not only reflected in new technologies and methods, but also reflected in ideas. This paper attempted to integrate the blockchain based on network data interaction into the cost control of the digital economy, and established a cost control system that adapted to the development needs of the times. This paper adopted the Analytic Hierarchy Process (AHP) method. It took cost control as the center of evaluation, and worked according to the overall cost impact degree, so as to minimize the impact on the overall cost during project implementation. The experimental results showed that when the throughput was 100, the time spent by system A and system B was 13.6s and 6.1s respectively, and the average delay of system A and system B was 1.25s and 0.27s respectively. It could be seen that the operation efficiency of system B was higher.

Yishu Liu, Ming Qiu. Blockchain Based on Network Data Interaction Helps the Construction of Digital Economy Cost Control System. International Journal of Business Management and Economics and Trade (2026), Vol. 7, Issue 3: 95-104. https://doi.org/10.38007/IJBMET.2026.070309.

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