The third subdistrict in loess hilly and gully erosion is one of the regional area that soil erosion monitoring had been carried out earlier in our country. The monitoring of slope runoff plots had been began in 1943，some typical small watersheds were selected in 1954 and since then, soil and water erosion had been monitored. After decades of development, some applicable experience in the monitoring of soil erosion had been accumulated. After about 20 years' construction, the facilities and equipment had been improved, and the monitoring contents had been testified practicable. After reviewing the typical and representative charac- teristics of Luoyugou catchment of the subdistrict No.Ⅲ，the principle, method and ideas in the construction of soil erosion monitoring system were summarized concisely, and the framework of the monitoring system was described in detail，we hope that this article could provide some reference for the network construction of soil erosion monitoring.