An experimental study is made on the effective utilization of rain-flood resources in a small watershed in Mid-Guizhou Plateau by taking the debris barrier typed mountain stream diversion works as the study case. The result shows that the occurring frequencies of heavy rain and rainstorm are high in the experimental watershed with large potential of utilizing rain-flood resources，while the rainstorm flood process has the feature of sharp rise and slow fall-down and then can sustain a longer time for water diversion，thus it is favorable for the effective utilization of the rain-flood resources.

利用径流小区观测法,分析了坡度和雨强对贵州喀斯特地区4种地类坡面产流产沙的影响.结果表明,随坡度的增大,各地类坡面产流产沙量并没有表现出一致增大或减小的趋势,它们在很大程度上受土地利用方式和土壤类型的制约；随最大30 min雨强(I30)的增大,坡面的产流产沙量增大.坡度为13°时,坡耕地在各地类中的产流产沙量最小,随坡度增大逐渐超过其他地类；除13°径流小区外,经济林地(梨树)在各种坡度、雨强范围内的产流产沙量均为各地类中最少；水保林地(香樟)在各种情况下的产流量虽较大,但产沙量相对较小；裸地在观测条件下的产流产沙量均较大.

Soil erosion and rocky desertifieation strongly affect local sustainable development in karst area. In order to prevent and control efficiently soil erosion in karst area of Guizhou Province, runoff and sediment characteristics of different types of slope land were studied by means of runoff plots observation. Five types of runoff plots were set including commercial forest （pear trees）, water conservation forest （Cinnamornurn camphora）, water conservation forest （cypress）, slope farmland （crops） and bare slope land. The results showed that when the slope gradient was 13~, the slope land covered with crops and pear trees were good in protecting soil erosion, which could reduce runoff by 47.5% and 25.8 %, respectively, and sediment yield by 78.5% and 58.9%, respectively. The slope land covered with Cinnarnornurn camphora and cypress were not significant in runoff reduction, while they could reduce sediment yield by 44.7% and 79.30%, respeetively. When the slope gradient was 18~, the slope land covered with pear trees, Cinnarnornum camphora, cypress and crops could reduce runoff by 45.8%, 4. 9%, 3. 80% and 16. 6%, respectively, and sediment yield by 91.3%, 81.1 %.0, 77.4% and 61.6%, respectively. When the slope gradients was 25∝, sediment yield of the slope farmland was almost eight times more than that of the bare slope farmland. Runoff and sediment yield had power function relationship with rainfall （p）, maximum rainfall intensity of 30 rain （I30） and slope gradients （s）. The sediment yield of slope land met linear function with the runoff of slope land.