Abstract: By taking a bottom water reservoir in eastern South China Sea as an example,the research on producing characteristic and development strategy of horizontal wells was carried out.Through Petrel RE,the multiple distribution of practical water crossing was calculated,and it was found that the multiple distribution along the horizontal section varied greatly,the fluid supply was seriously unbalanced and there existed low efficient sections without water flooding,all of these greatly affecting horizontal well development effect.In response to this kind of phenomenon,through the study on working principle and oil incremental mechanism of AICD(Auto Inflow Control Device),it is believed that compared with ICD(Inflow Control Device),AICD can automatically control water,provide balanced fluid,more efficiently increase the horizontal well sections,better improve the development effect and it has been verified in the reservoir numerical simulation.Therefore,AICD has good application prospect.