In construction project management, the increase of project cost due to resource fluctuation is widespread. This paper proposed new resource leveling control indicators reflecting resources idle and resources mobilizing. According to the disadvantages of traditional control indicators of resource leveling in project network planning, considering the substantial increased costs due to resources fluctuation, based on the classification of extra costs, this study found out the relationship between resource imbalance and extra costs, analyzed resources idle and resources mobilizing cost variation caused by resource imbalance. Thus, the control indicators of resources and resources mobilizing reflecting resource leveling are proposed. In addition, based on case study, the feasibility of the control indicators proposed in this paper for resource leveling in project network planning was validated. The information is valuable in practical application for the resource leveling optimization in engineering project management.