Abstract: The hydrological effect of canopy,litter and soil of different plantations in the west of Miyun reservoir in Beijing were observed and analyzed.The results showed that canopy interception,throughfall and stemflow of Pinus tabuleaefomis and the mixed Quercus acutissima and Platycladus orientalis stands account for 8.46%-8.97%,30.80%-90.63%,0.12%-1.62% and 0.53%-29.35%,68.48%-93.71%,2.17%-5.76% of the rainfall input in open field,respectively.The average rates of canopy interception are 29.23% and 18.21% for the pine stand and mixed stand.The maximum water holding capacity of the litters of the two stands are 1.51 mm and 1.76 mm,respectively.The maximum and the effective soil water storage capacity of 0-30 cm soil layer in Pinus tabuleaefomis plantation and the mixed Quercus acutissima and Platycladus orientalis stands are 204.90 mm and 68.23 mm,160.80 mm and 41.87 mm,respectively.The stable infiltration rate are 0.68 mm/min and 0.22 mm/min in Pinus tabuleaefomis plantation and the mixed Quercus acutissima and Platycladus orientalis stands,respectively.