Abstract: Abstract：Based on the panel data from 285 prefecture-level cities or above in China during 2006 and 2016, this article adapts the dynamic panel data model with System GMM estimation method and panel threshold regression model to disclose the effect of the specialized and diversified industrial agglomeration on urban water intensity. On this basis, the stage characteristics of different industrial agglomeration types and water use intensity are tested by introducing economic development level, infrastructure construction level and employment density as the threshold variables. The results indicate that: (1) Specialized industrial agglomeration alleviates the intensity of urban water by realizing positive technology spillover. (2) Similarly, diversified industrial agglomeration reveals a saving role in the process of urban water resource utilization. (3) Under the adjusting effect of urban scale, the relationship between different industrial agglomeration types and urban water intensity shows obvious characteristics of regime switching. (4) With the continued expansion of economic scale, industrial clusters will gradually become saturated, moreover, the situation of water resources competition will intensify, and the allocation efficiency of water resources will be reduced.(5) When urban infrastructure is limited, over-agglomeration exceeds regional carrying capacity, which will lead to vicious competition for public infrastructure and make it difficult to exert the positive spillover effect on urban water resources allocation. （6） In addition, as the employment density increases further, the mechanism of path dependence of specialized industrial agglomeration may induce technology lock-in effect. However, due to the diverse knowledge base, the labor pooling effect of diversified industrial agglomeration is more obvious, meanwhile, the improvement of collaborative learning ability will promote the green technology progress and bring water-saving effect into full play.