It is worthy to study the effective cost control since the State Grid Corporation has vigorously implemented the engineering volume management. Based on the previous concept of constructing budget drawings, the concept of constructing drawings management budget has been proposed in this paper. By deep analyzing the construction drawings budget of amount difference, the real-time monitoring of the amount of construction, materials and costs in the construction had been enhanced in order to improve the management level in engineering. The case study shows that the application effect of the construction drawings management budget is significantly, and it is strongly operational and applicable, which can provide a decision-making support for the power transmission project management.