Ecological forest of Beijing was all-important for improving air quality,conserving water and soil water conservation and so on. The ability of water conservation of Platycladus orientalis plantation in Beijing mountain area was researched and divided into 3 site types:sunny slope and thin soil,sunny slope and thick soil and shady slope and thick soil. Two levels of soil and litter were analyzed. The results showed that soil bulk density of the sunny slope and thin soil was the lowest but the permeability a...