The rainfall installation of simulated soil erosion experiment hall has been running well since it was finished in 1992. It is the best on the areas of adjusting range of rainfall intensity, the consistent degree of raindrop characteristics between a rtificial and natural rainfall, and degree of automatically controlling etc.thus play an important role in soil erosion experiment research. Based on the impo- rtant meaning of simulated soil erosion experiment, the desin evidence about some installations (including rainfall spray nozzle, water supply pipenet etc.), installation selection, and arrangement etc. is introduced briefly. Meanwhile, the basic characteristics of simulated rainfall are also explained.