Abstract: In this study, the effects of simulated rainfalls with different intensities (50, 75, 100 and 125 mm h-1) on crust formation and soil erosion by water were investigated as using a rain simulator (Vejeet 80100) under laboratory conditions. Erosion plots, 30 x 45 x 15 cm sized and perforated, were placed into coarse s and (7 cm thick) and soil samples sewed by 8 mm (5 cm thick). After rainstorms applied, erosion plots were waited under an infrared lamps platform which has 4 lamps during 24 h. Than crust strengths were measured by a hand penentrometer (EL 516-030). 2nd simulated rainfalls were again applied on erosion plots (at the same intensities). According to research, increased intensities had increased runoff, soil loss and crust strength. It was found that crusting had significantly effected on runoff but no effected on soil loss.