household RO membrane element series have the following advantages compared with traditional RO membrane element series:Water flux increases 30%-40% ratio under the same desalination rate, keeps a long-term steady operation at an extra low pressure, with water flux almost not attenuated; high selectivity of aquaporin to more effectively remove impurities, bacteria, virus, heavy metals, water scale, excessive residual chlorine, pesticides, antibiotics and other organic pollutants in water, with extremely high interception rate for boron and arsenic, ensuring the safety of drinking water, and satisfying the strict standards of World Health Organization (WHO) and those in other drinking water. This technology is applicable to household RO water filter with a higher water quality requirement.