S SBR system represent a variation of the activated sludge process. The advantage of SBR is its ability to act as an equalization basin, aeration basin, and clarifier within a single reactor , without having sludge recirculation. The SBR is operated in a true batch reactor which depends on a cyclic repetition of reactor phases. The SBR process can be employed to treat any wastewater with some modification to suit the treatment requirements. The textile waste from PT Kanebo Indonesia Mills ((KITM)contained high nitrogen with average of 123, 714 mg/L as total Kjeldahl nitrogen. These subtances are a threat to the aquatic life it were discharged directly into a watercourse. A. modification to create anoxic and aerobic condition intermittently on SBR during the filling time, is due to accommodate the nitrification and denitrification process to removal al process nitrogen removal purposes. By conducting the variatiuon of F/M and MLSS. the experiment showed that the nitrification and denitrification process occured slightly within the SBR with average percentation nitrification of 51, 45 - 57 , 94 % and average percentatian denitrification of 51, 23- 57, 51 %. The percentation of nitrification and denitrification process was increasing according to the incremental of FM ratio, but overall nitrogen removal has not been reached due to the high nitrogen contents in the effluent.