Based on analysis of the studies on runoff and sediment yield and hydrological effect in forest watersheds, major advances and problems are assessed and main trends of research in this field pointed out.

Based on the information of 33 times rainfall,runoff and sediment yield at No 3runoff plot in Zizhou Tuanshangou watershed,the variation of rainfall and runoff-sediment yieldon slope surface under diffrent rain pattern are analyzed by using statistic method.

Study on the effect of vegetation patterns on runoff and sediment production filed in slope;

In order to study the effect of precipitation and vegetationon runoff and sediment production,experimental data from typical sample plots of Caijiachuan watershed were analyzed,which will provide theoretical basis for vegetation constru.

Study on the Small Watershed Runoff and Sediment and Nutrient Loss in Wanchanggou of Guangyuan City;

In order to analyze the influence of land use on soil and water resources, the character of runoff and sediment in different land use should be studied, particularly the relation with rainfall character.