Abstract: In the development process of a bottom water reservoir in an oilfield in the west of South China Sea, there are some problems such as high water content, premature water flooding of oil wells and gradual deterioration of development effect. In order to reduce the water content of development wells and improve oil well production, combined with the analysis of the technical principle of the existing intelligent water control tools, the water control simulation software was used to carry out the numerical simulation of the sectional design and water control screen tube parameter design of a certain horizontal well in the oilfield, and an intelligent water control scheme of horizontal wells was formed. The on-site application shows that after adopting the intelligent water control scheme, the initial water control effect in the early stage of oil well production is good, with a maximum water content reduction of 56.67% and an oil production rate increase about 13%, which has good water control effect and guiding significance.