Three levels of sampling,1 sample/1km 2, 1 sample/100～1000km 2 and 1 sample/1000～10000km 2 were designed to test the representativity of wide spaced floodplain sediment sampling.

Chinese character is the only pictograph using in the world,as the material carrier of China s traditional culture,it has been showing its prolonged glamor as the Chinese reserch and culture are more and more popular and the "word explanation" can be found in the field of Chinese explanation,we are facing the crisis of culture overflows.