On the basis of the monthly precipitation data for the period 1961-2000 collected from 96 observational stations in Southwest China (SWC),the methods of principal component analysis, rotated principal component analysis,and wavelet analysis are used to analyze the spatial and temporal characteristics of annual precipitation resource.

Analysis of precipitation resources on convective cloud in summer;

There is plenty of precipitation resources and passing_by water resources on Sanjiang Plain which is located in frozen region and where the crops are just planted for one season,and analysed by one_season crops need for water resources, the modulus of Sanjiang Plain is 28.

Research and application of techniques of highly-effective utilization of precipitation resource in west Henan;

Using the theory of environmental capacity of precipitation resource and water balance, the paper studied the water balance analyzing and the fitting afforestation density of 10 year Platycladus orientalis on Loess Plateau.

During the past years, many new techniques of water storage, conservation, harvesting and utilization with high efficient utilization of precipitation resource on dry farming lands have b.

this paper made an elementary estimation and evaluation of rainfall resource availability potential in ecological using land.

Last but not least important,the technology of rainfall resource availability not only increase both production and income,but also has regional predominance clearly,and can\'t solicit the ecological and environmental problem in the large.

Numerous problems are presented here which comprise the optimal ecology-oriented allocation of water resources, the optimal precipitation-based allocation of water resources, water resources allocation for different regions under different conditions, and the principle of 40% allocation for river water resources, as well as other related problems.