Abstract: To investigate the relationship between water resources utilization and economic development in the Tuojiang River Green Development Economic Belt, a matching degree calculation method based on numerical sequences was adopted to analyze the matching status between water use structure and industrial structure from 2011 to 2022. The results indicate that: (1) Chengdu recorded the highest water resources volume and water consumption, which were 5.82 times and 8.44 times higher than those of Zigong (the lowest), respectively. Agricultural water use constituted the largest share across all cities, industrial water use decreased significantly, while domestic water consumption showed a fluctuating upward trend. (2) The average annual growth rate of the total GDP for the economic belt reached 9.3%. Except for Ziyang, all other cities maintained steady GDP growth. Furthermore, Chengdu, Neijiang, Zigong, and Ziyang have achieved an industrial structure transformation dominated by the tertiary sector. (3) The spatial matching degree between total water consumption and total GDP for the economic belt waJP2s at a relatively matched level or above. The spatial matching degree, in descending order, was Zigong (0.99) ＞ Neijiang (0.97) = Luzhou (0.97) ＞ Ziyang (0.96) ＞ Deyang (0.87) ＞ Chengdu (0.78). (4) The temporal matching degree between water use structure and industrial structure in each city showed that the matching degree between agricultural water use and the primary industry was generally higher than that of other sectors. The matching degrees between industrial water use and the secondary industry, and between domestic water use and the tertiary industry, both exhibited a transition from "mismatch → match → mismatch," which is associated with improvements in water use efficiency and the transformation/upgrading of the industrial structure.