Abstract: In view of the complexity of process and resource constraints in mining engineering projects, taking the logical relationship between multiple resources and processes required in the project as constraints, with the goal of achieving the lowest cost and the shortest construction period, the critical chain is introduced and a project schedule management model is established.In the model, a control group is set first, and the resource supply limit is changed, and the optimal resource limit and initial plan are determined by comparing costs and duration; secondly, gray correlation analysis is used in the identification method of the critical chain, and the process duration is comprehensively considered.The influence degree of resources and the duration of the next process are used to determine the gray correlation degree, so as to adjust the priority of the process; finally, the complete schedule is obtained by combining the buffer.Taking a mine intelligent concentrator project in Shandong as an example, using a schedule optimization model based on critical chain technology to plan the project, it is concluded that the model can not only ensure the project's completion on time, but also save costs.It has multiple resource constraints and project procedures.Projects with complex structures are applicable.