This　study　focuses　on　the　effect　of　backwash　temperatures　(25,　40,　and　55　degrees　C)　on　hollow　fiber　ultrafiltration　membranes　fouled　by　sodium　alginate　(SA).　The　results　indicate　that　a　higher　backwash　temperature　could　achieve　a　significant　mitigation　of　total　backwash　resistance　and　a　cleaning　rate　promotion.　In　the　following　cycle,　the　initial　total　fouling　resistance　was　decreased　with　the　temperature　increase,　while　there　was　an　undesirable　increase　on　the　fouling　rate　due　to　a　higher　SA　concentration　in　the　membrane　pool.　Although　the　membrane　fouling　resistance　was　more　reversible,　backwash　at　55　degrees　C　had　a　negative　impact　on　the　SA　removal,　because　the　functional　gel　layer　was　washed　out.　Moreover,　all　the　beneficial　effects　from　25　to　40　degrees　C　were　more　noticeable　than　those　from　40　to　55　degrees　C.　Overall,　backwash　at　40　degrees　C　was　relatively　a　better　choice　in　this　study.