Abstract: The product ion of dry plant material in steppe community is deter-mined by photosynthesis and respiration. Respiration provides the necessary energy for growth of steppe plants. While under stress environmental conditions, such as high temperature, drought or low moisture, etc., the uneffective respriation of the plant community will increase and the pho-tosynthetical products will be over consumed. Hence the efficiency of photosynthesis decreases consequently. On the other hand, under the proper environmental conditions the dark respiration of steppe community is affec-ted by air temperature. The dark respiration drops about a half with each drop of 5℃. Under dry condition, the dark respiration of community incre-ases with the increase of moisture. These concern with the growth rate of community. under good soil water condition.The growth rate of community and the production of dry material will be raised when increasing the amount of fertilizer to the soil. with that the dark respiration will beincreased relevantly.