This　study　focuses　on　distribution　of　light　pollution　water　with　low　turbidity,　by　adjusting　dosage　of　polyaluminum　chloride(PACI)　to　control　floc　zeta　potential.　Influence　of　backwash　water(FBWW)with　different　coagulation　characteristics　from　filter　on　coagulation　efficiency　was　also　investigated.　The　results　show　that　FBWW　is　of　good　efficiency　on　turbidity　removal　as　zeta　potential　close　to　-11　mV.　The　maximum　removal　rate　for　settled　water　was　63.81%,　and　it　was　higher　than　that　at　other　potentials　by　using　this　processing.　And　the　lowest　residual　AlP　content　was　found　about　0.271　mg·L-1　at　this　potential.　However,　excessive　backflow(12%)can　lead　to　additional　consumption　of　PACl　in　this　stage,　which　makes　particle　matter　in　raw　water　to　obtain　sufficient　coagulant　difficult　and　the　system　to　lose　stabilization,　and　so,　turbidity,　CODMn,　AlP,　AlD,　etc.　goes　up.　When　zeta　potential　is　close　to　0　mV,　the　FBWW　is　also　of　good　effect　on　CODMn,　UV254　and　AlP,　and　AlD　can　stay　in　a　relative　low　value　as　well.　If　reflux　ratio　is　9%,　the　removal　rate　of　CODMn　can　reach　the　highest　test　value,　about　34.21%.　When　zeta　potential　is　placed　at　close　to　+4　mV,　the　reflux　of　FBWW　can　cause　substantial　increase　of　turbidity,　CODMn,　AlP　and　AlD,　while　removal　efficiency　for　UV245　is　improved.　This　trend　was　most　obvious　for　the　backflow　ratio　about　12%,　at　which　the　highest　test　value　of　UV254(60.67%)is　obtained.　By　comparing　residual　organic　matters　in　filtered　and　settled　water,　a　significant　difference　between　these　organic　matters　is　found.　The　removal　rates　of　UV254　and　CODMn　were　higher　for　the　filtered　water　at　+4　mV.　©　All　Rights　Reserved.