Abstract: Objective: Urban rail transit lines have relatively fixed operation time periods, the shorter time spent on construction organization essential procedures, the higher construction time period utilization rate in organizing construction maintenance work. To enhance the utilization of night construction period and ensure sufficient time for construction maintenance work, it is necessary to optimize and control time consumption of construction organization essential procedures. Method: Considering the factors influencing the utilization rate of construction time period, problems in construction organization essential procedures such as site application, site clearance, power outage, power supply, wire grounding and dismantling, as well as in construction organization process and organization modes, are sorted and analyzed. Optimization measures are proposed from four aspects correspondingly, including optimizing construction organization modes, streamlining work process, standardizing work time criteria, and improving equipment operation speed, in order to reduce the time required for power outage work and power outage combined with wire grounding work in construction organization essential procedures, ultimately increasing the utilization rate of construction periods. Result & Conclusion: The abovementioned optimization measures are applied to upgrade and transform the construction dispatching system of Xiamen Metro Line 2, and standardization requirements are implemented for personnel operation behavior. After introducing standardized management of work time, the utilization rate of construction time periods for power outage work increases from 81.25% to 87.92%, and for power outage combined with wire grounding work, it increases from 72.92% to 81.25%. The proposed optimization measures demonstrate good improvement effects of urban rail transit night construction time period utilization rate.