165 pieces of standard land and 561 standard trees were collected in Simao and Xishuanbanna to compose standard chart of stock amount of section area of planted Pinus khasys forest.

The diversity of flood elements and complexity of flood are analyzed Two methods for classifying flood grades by flood recurrenceinterval or peak discharge of standard area are put forward in this paper And, the flood grades of the Yangtze River drainage basin in 1998 are analyzed

On the control over area standard for urban housing;