The Wenchuan earthquake led to a lot of landslide deposit. It was triggered more serious secondary geological disasters under the condition of rain washing out. In this article, the landslide deposit was chosen to be the research object in the Wenchuan earthquake area, an artificial rainfall device was used to conduct indoor rainfall-interflow production observation experiment at different rainfall intensities (1.0,1.5,2.0 mm/min) and soil-rock ratios(1︰1,1︰2,1︰4). The results indicated that: (1) The interflow increase rapidly in the beginning, then stabilized gradually until the rainfall stopped under the different rock-ratio. (2) The interflow yield presented a significant positive correlation with the rainfall time (R2=0.946 5～0.999 6). (3) Except for the soil-rock 1︰4 of landslide deposit, the time of the interflow production process showed significantly different laws between the soil-rock 1︰1 and 1︰2 is opposite under the increase of rainfall intensity. (4) The soil-rock 1︰4 of landslide deposit only produced interflow yield; Except for the time of interflow production was a little longer than the time of surface runoff when the soil-rock 1︰1 of landslide deposit under the conditions of 2.0 mm/min rainfall intensity, the other’s interflow production was shorter than the time of surface runoff within 10 min.