The safety of drinking water is becoming more and more obvious.Combined with the current economic situation in China，urban and rural water supply integration is to consolidate and improve the quality of rural drinking water more cost-effective measures.Flap filter mainly used in large and medium-sized waterworks，has the advantages of good filtering effect，good backwashing effect，high cleanliness of filter material，simple structure，investment and other advantages，and can be apply to urban and rural water supply integration project，effectively eliminating urban and rural water supply diversification.Da Shi Kou water works in the county of Fu Liang was expanded and transformed with flap filter technology，in the filter water turbidity of about 3.0 NTU，the treated water turbidity is under 0.5 NTU and run stability；the investment of flap filter is 89 yuan per ton water，so it has certain popularization and application value.