When raindrops hit the soil, they trigger rain splash and formation of soil crust.Researchers used to pay attention to interactions of them.However, the relationships between the two varying with particle size of the soil have seldom been reported.Under simulated rainfalls in laboratory, splash erosion and soil crust development of Loess soils different in particle-size are observed and analyzed.Results show that distinct differences exist in amount of rain splash between soil samples.Soil samples about 0.15 mm in particle-size are the most susceptible to rain splash.Within a given duration of rainfall, the development of soil crust also varies with particle-size of the soil, which explains variation of splash rate.