With the rapid economic development in China, the establishment of one-household-one-meter policy was an important reform of water supply charge system due to its significant influence on NRW (None Revenue Water). As the newest municipality directly under the jurisdiction of the Central Government in China, Chongqing is putting into practice of one-household-one-meter transform vigorously in this recent year. In order to study the influence of one-household-one-meter transformation on NRW, this study selected 5 representative controlled zone testing fields of one-household-one-meter transformation in Chongqing, China, collected and tested the corresponding data for a period of 6 months on site running, and analyzed the effects of one-household-one-meter transform on the rate of NRW. The contents include: analysis of the effect of construction quality of one-household-one-meter transformation on NRW; effect of conventional one-household-one-meter transformation on NRW; effect of improved transformation of one-household-one-meter on NRW; analysis of the function of drip-proof valve and its working rules; development of effective strategies on NRW control. It shows that: the construction quality of one-household-one-meter transformation can influence the rate of NRW significantly; the conventional transformation of one-household-one-meter will result in an increase on the rate of NRW.