Removal　effects　of　DOC　and　A254　are　investigated　with　pretreatment　processes　of　sand　filtration,　fibrous　filtration,　coagulation-sand　filtration　and　coagulation-fibrous　filtration　combined　with　ultrafiltration,　compared　with　direct　ultrafiltration　under　pilot　scale.　Influence　of　organic　matter　removal　of　ultrafiltration　is　probed　by　various　pretreatment　processes.　Results　show　that　effects　of　organic　matter　removal　can　be　enhanced　by　the　pretreatment　processes.　A254　removal　rate　of　ultrafiltration　outlet　is　raised　16,　7,　23　and　14　percentage　points　and　DOC　removal　rate　of　ultrafiltration　outlet　is　raised　17,　14,　27　and　19　percentage　points,　with　pretreatment　of　sand　filtration,　fibrous　filtration,　coagulation-sand　filtration　and　coagulation-fibrous　filtration,　compared　with　direct　ultrafiltration.　The　organic　matter　removal　effect　and　stabilization　of　coagulation-sand　filtration　process　is　better　than　other　process.　It　is　highly　effective　to　improve　membrane　treatment　efficiency　and　membrane　contamination　protection　apply　DOC　and　A254　indexes　of　treated　water　by　ultrafiltration　are　improved　clearly.　The　best　effect　is　achieved　by　coagulation-sand　filtration　process.　The　coagulation　process　is　showed　remarkable　contribution　to　DOC　and　A254　removal.