The results show that: 1) There exist two kinds of groundwater flow systems in the mountain area: the local groundwater flow system and the regional groundwater flow system. The local groundwater system gets recharge from the precipitation and melt water at local site,and discharges to the near stream with a rapid renewal rate. According to the result of two-component mixing model,about 76% of the local groundwater is recharged from precipitation and 24% from melt water.