Based on the statistical data of input-output table and water resource bulletin of Jiangsu Province in 2012, the water trade intensity and the net outflow of virtual water are calculated by using the revised input-output model so as to realize the effects of saving water at the largest degree. The results show that there is a net virtual water inflow in Jiangsu Province in 2012 on the whole, and it is in favor of saving water. Under the given three specified trade input-output ranges of 5%, 10% and 15%, the industries of chemical products and coal mining products exhibit the large-scale water-saving effects. With the increase of the adjusted range of trade, the effects of saving water are larger and larger in the industries with large net outflow of virtual water. At present, the trade of virtual water is an important way of realizing resource saving and economic development, and it may provide basis and reference for the government to make decisions on structural adjustment of trade.