Abstract: The annual yield of dry grass in the natural pasture of Chaganbuligesumu of Siziwang banner in Inner Mongolia was 450 kg/ hm^2 and the quality of forage grass and feed supplied by this natural pasture was evaluated to be I st grade comprehensively. The grass- measurement formulation technology was used by the writer to guide the herdsmen, who cultured 600 sheep on 333.33 hm^2 pasture. The resuhs showed that every hectare of pasture needed to be supplimented with 494.70 kg dry grass, 3.60 kg crude protein and 1.05 kg phosphorous annually.