In order to study the influence of water network construction and water network optimization and allocation technology on the evolution of water resources system resilience in Guanzhong area of Shaanxi Province,an evaluation index system for water resources system resilience was constructed based on the complex network theory. The water resources system resilience before and after the construction of the water network in the base year and planning year of 2020 and 2035 is calculated by using the optimized allocation technology. Optimized dispatch model and optimized configuration model of the water network of the Guanzhong reservoir group were constructed combining with the Hanjiang-to-Weihe River Water Diversion Project, the Dongzhuang and Guxian reservoir water supply projects, eight major medium-to-large-scale regulating reservoirs in Guanzhong area, groundwater resources, and unconventional water sources. The model is solved by dynamic programming and genetic algorithm,and the balance between water supply and demand in the base year and planning year is analyzed. The results show that after the joint optimization and allocation of the reservoir group, the water resources system resilience in Guanzhong area has been improved except for Yangling, with the overall resilience improving from 31.11 to 32.22, an increase of 3.57%; the resilience of the water resources system in the planning year is increased from 44.05 to 44.51, a 1.04% improvement compared to the pre-optimization allocation scenario; the resilience of the water resources system increased from 31.11 to 44.05, an increase 41.59%, after the construction of the water network.