According to the "Statistical Monitoring Work Plan for Yangtze River Delta Integration Development" and the monitoring system, the calculation results from the Yangtze River Delta Integration Development Statistical Monitoring Office (Shanghai Statistics Bureau) show that in 2023, the development index of the Yangtze River Delta region is 132.6 (with 2015 as the base year), an increase of 3.3 compared to 2022. Since the Yangtze River Delta Integration Development was raised to national strategy in 2018, the regional development index has increased by an average of 3.3 each year, with all six sub-item indices rising. Among them, the sub-indices for innovation co-construction, coordinated progress, and green co-guarding have improved rapidly, with an average annual increase of over 5.0 compared to 2018; the sub-indices of demonstration leadership and shared livelihood have steadily improved, increasing by an average of 2.2 and 3.3 each year respectively; the sub-index of open win-win has gradually recovered and fluctuated upward, with an average annual increase of 0.2.