石匣小流域地处北京币密云水库的东北，行政隶属密云县高岭镇，按水系划分属潮河下游，包括白河涧、遥事、芹菜岭等8个行政村，总面积33km2，属燕山山脉，为土石浅山丘陵区，地势北高南低，海拔高程150－390m，地面起伏，坡面和缓。岩石以片麻岩为主，间有花岗岩和石灰岩。土壤 Shixia small watershed is located in the northeast of Beijing currency Miyun Reservoir. The administrative department is under the jurisdiction of Gaoling County, Miyun County. According to the water system, it belongs to the lower reaches of Chao River, including 8 administrative villages such as Baihe River, Mountains, mountainous area for earth and rock, terrain north and south low elevation of 150-390m, the ground ups and downs, gentle slopes. The rock is dominated by gneiss, with granite and limestone. soil