NOVELTY - Sewage is de-phosphorized and denitrified by flowing sewage into anaerobic pool via a water groove; leaving the sewage in anaerobic pool for 1-2 days to reduce organic matter concentration to be less than 100 mg/; flowing the sewage to ecotypic pond by water outlet groove leaving the sewage in the ecotypic pond for 0.5-1 day; flowing the sewage to ecotypic channel that is 0.5-1 meter lower than the ecotypic pond; and keeping the sewage in the ecotypic channel for 1-2 days.    USE - Method for small-scale de-phosphorizing and denitrifying sewage (claimed) from growing economic plants.    ADVANTAGE - The method has good treating effect, low investing and operating cost and simple maintenance; and efficiently utilizes nitrogen and phosphorus resource in the sewage.    DETAILED DESCRIPTION - A combined small-scale sewage de-phosphorizing and denitrifying method of anaerobic-ecotypic pond-ecotypic channel comprises flowing sewage into anaerobic pool via a water groove; leaving the sewage in anaerobic pool for 1-2 days to reduce organic matter concentration to be less than 100 mg/; flowing the sewage to ecotypic pond by water outlet groove leaving the sewage in the ecotypic pond for 0.5-1 day, where the pond has water depth of 0.8-1.2 meters and the water is in plug-flow state; flowing the sewage to ecotypic channel that is 0.5-1 meter lower than the ecotypic pond; and keeping the sewage in the ecotypic channel for 1-2 days, where the channel has water depth of 0.6-1 meter. The ecotypic pond has guiding wall set with water inlet and water outlet, porous ecotypic concrete building blocks (11) are used for protecting slope, several ecotypic floating floors with planar area and elastic fillings, and aeration machine which starts when dissolved oxygen in water is less than 1 mg/l. The building blocks have surface coated with soil and planted with canna and ryegrass. Oenanthe stolonifera is grown on the ecotypic floating floors in winter and water Convolvulus is grown on the ecotypic floating floors in spring, summer and autumn. The ecotypic channel can be natural or man made earth channel; has side slope and bottom being protected and piled by ecotypic concrete balls coated with soil and planted with canna and ryegrass, and water surface planted with hydrophytic economic plant. The anaerobic pool is two-stage anaerobic pool being filled with gravel filter material and being fully close and set under the ground.