Currently influence of water quality of water resource is greatly affected typhoon and rainstorm caused by climate change. Additional factors are including over cut trees, soil-rock flood and bad conservation of water-soil in hillside. Thus many researchers used ¡§membrane technology ¡§to remove pollutants such as suspended solids, alga, heavy metals and organic toxics. This work is studying performance of advanced water treatment processes using UF and LPRO membranes in a plant (noted as plant A). During the period of research; we analyzed items such as turbidity, TOC and hardness and operation parameters to investigate the efficiency of UF and LPRO. Results showed the traditional treatment processes has not effective removal on TOC, Fe ions ,Mn ions and hardness in raw water in plant A. But the removal efficiency was over 80% by using the later treatment of UF/RO. When plant A operated at good control and well detergent-wash, the life of UF/RO system is longer.