Abstract:Dinghushan Biosphere Reserve was in the extent of acid rain hazard. The runoff water quality in the forest can show the response of regional geochemistry conditions to the processes of environmental acidification. Three samples about the water quality background value of two streams (two from the east stream and one from the west stream) in Dinghushan Biosphere Reserve were analyzed. The total organic carbon were 0 87mg·L -1 , 1 26 mg·L -1 (for east stream) and 1.51 mg·L -1 (for west stream)...