The runoff and sediment on slope plot are measured with water concentrate pond or box currently, which could measure amount of runoff and sediment of a single storm rainfall but not the dynamic change of them during the process of rainfall, and could not determine the amount of runoff and sediment under various intensities accurately. Because the installations currently used in small watershed are mostly for artificial measurement at fixed time, it is difficult to determine the variation of runoff with time precisely and is with greater errow in measurement, the pracaticality of the data is poor. The paper introduces the station to measure runoff and sediment automatically, set in two experimental small watersheds in Sunjigou gully at Tienongwan Forestry Field of Yichuan county, to evaluate the benefits of forest in reduction of water and sediment. The two stations may provide the data on the flow process of flood short in the study of runoff and sediment, being thought as the efficient tools for the dynamic monitoring of runoff and sediment.