Bird communities are very sensitive to environmental changes, The changes in vegetation will rapidly lead to a change in the composition of bird communities. For comparing the changes of common species in bird communities in the Tianmou shan area for the last twenty years, observations were carried out from 1979-1980, The index of species diversity was described with community information principle of Shannon-Wiener and the calculation was carried out with the formula of diversity index of Pielou E. C.Table...