NOVELTY - A starvation treatment comprises preprocessing of water source, cutting biochemical pool, and stopping supply of dissolved oxygen (DO); stirring anaerobic biochemical pond, making active sludge in the organic matter and anaerobic hungry state DO supplied to the sludge, testing once a day sludge volume index (SVI); and recovering the normal biochemical pool water inlet and DO supply, delivering of the biochemical pool/aerobic alternate operation mode, setting aerobic residence time ratio, removing nitrogen and phosphorus to recover the sludge, and maintaining micro-expansion of sludge age.    USE - Method for starvation treatment used for quickly solving filamentous fungus sludge expansion problem (claimed).    ADVANTAGE - The method has large number of large surface area, low-cost solution, does not require the additional economic energy, can kill filamentous fungus, and short activity recovery of late zoogloea bacteria.    DETAILED DESCRIPTION - A starvation treatment comprises preprocessing of water source, cutting biochemical pool, and stopping supply of DO; continuously stirring the anaerobic biochemical pond, making active sludge in the organic matter and anaerobic hungry state DO supplied to the sludge, testing once a day sludge volume index (SVI), when SVI is greater than or equal to 150 ml/g, complete starvation process, and starvation time is 3-10 days; and recovering the normal biochemical pool water inlet and DO supply, delivering of the biochemical pool/aerobic alternate operation mode, setting aerobic residence time ratio at 2:3, maintaining aerobic conditions, DO concentration is more than 2 mg/l, keeping the reaction temperature at 20-25 degrees C, water inlet organic load is more than 0.2 kg chemical oxygen demand (COD)/kg mixed liquor suspended solids (MLSS)/day, the activity and ability for removing nitrogen and phosphorus to recover the sludge at intervals of 2-3 days and has concentration of less than 2000 mg/l, not discharging the system, and maintaining micro-expansion of sludge age of 8-15 days.