Abstract: Taking the preparation of final drawing design plan in the design project of nuclear power conventional island by northeast electric power design institute CO., LTD as the starting point, this paper conducts in-depth research and discussion in the current situation that this process is complicated, and it is difficult to monitor the coordination of multiple equipment manufacturers, multiple positions and multiple professions, and the accuracy of planning preparation by labor is low. Considering situation listed above, this paper provide a solution that is developing the final drawing design plan management software based on expanding the function of the original nuclear power conventional island project design management system. Through the use of this software, all the elements necessary for the final drawing design plan, such as the external interface information of equipment, the professional internal mutual reference information and the necessary design schedule, are all clearly related in a logical relationship. It greatly improves the efficiency of the final drawing design plan preparation, which helps to enhance the design and management efficiency of the project, and makes the management of the nuclear power conventional island design project more targeted.