BACKGROUND:　This　research　focused　on　the　impacts　of　different　dibutyl　phthalate　(DBP)/dioctyl　phthalate　(DOP)　weight　ratios　on　the　surface　morphology　and　the　properties　of　poly　(vinylidene　fluoride)　(PVDF)　thermally　induced　phase　separation　(TIPS)　microfiltration　hollow　fiber　membranes.　The　phase　diagrams　of　PVDF/DBP/DOP　systems　were　determined　and　the　optimum　weight　ratio　DBP/DOP　in　the　liquid-liquid　region　of　the　binary　phase　diagram　was　chosen　to　form　a　membrane　with　interconnected　sponge-like　structure.　Optimum　processing　temperature　was　determined　based　on　analysis　of　the　phase　diagrams　and　industrial　applications.　In　addition,　the　morphology　and　properties　of　the　membranes　were　characterized　as　well　as　the　performance　of　the　membrane　modules.　RESULTS:　Suitable　processing　temperature　range　for　the　PVDF　TIPS　process　was　from　430　to　493　K.　A　PVDF　concentration　of　35wt%　and　weight　ratio　DBP/DOP　of　1/2　provided　the　most　appropriate　membrane　for　industrial　application.　CONCLUSIONS:　The　optimum　processing　temperature　range　for　the　PVDF　TIPS　process　was　determined.　The　weight　ratio　DBP/DOP　in　PVDF/DBP/DOP　systems　played　an　important　role　in　preparing　PVDF　TIPS　microfiltration　hollow　fibers　with　superior　properties　giving　membranes　suitable　for　industrial　application.　(C)　2015　Society　of　Chemical　Industry