In　order　to　investigate　the　relationship　between　operating　temperature　and　sludge　settleability,　five　sequencing　batch　reactors　with　automatic　control　equipment　were　adopted　to　explore　the　effect　of　different　operating　temperature　(15,　20,　25,　30　and　35℃)　on　sludge　settleability　and　microbial　community　structure.　The　results　showed　that:　when　inflowing　time　was　five　minutes,　sludge　bulking　did　not　occurred　in　all　systems.　This　was　due　to　that　effect　of　operating　temperature　on　sludge　settleability　was　much　weaker　than　substrate　concentration,　and　the　dominating　filamentous　bacterium　were　Type　0041　and　Type　0092;　when　five　hours　were　adopted,　five　systems　were　occurred　filamentous　bulking　phenomenon　and　SVI　value　increased　as　operating　temperature　(15~30℃)　rising　due　to　the　interaction　between　temperature　and　low　substrate　concentration.　While　operating　temperature　was　35℃,　SVI　value　was　lower　than　that　in　30℃.　Moreover,　the　features　of　the　intracellular　storage　and　extracellular　storage　as　well　as　the　types　of　dominating　filamentous　bacteria　had　a　great　difference　when　operating　temperature　was　different.　©　2016,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.