The combination of uplift denudation area and piedmont depositional area bounded by strike- slip fault is one of the important types of basin- mountain system. Due to the continuous relative slip between the two plates of the strike- slip fault, the spatial relationship between the source and sedimentary area on both sides of the strike- slip fault constantly changes as the fault slips. The coupling mechanism between source and sedimentary systems on both sides of the strike- slip fault needs to be investigated. Towards this end, a simplified geomorphic sandbox experiment was designed to reveal the distribution of sediment eroded from the intrusive bodies in the source area. The experimental results showed that the distribution area of the sedimentary signal of the intrusive bodies in the sedimentary area was affected by many factors, including the shape of the piedmont alluvial fan and the distribution of the intrusive bodies in different drainages. Due to the fan- shaped development of the alluvial sediment, the sedimentary signals were distributed in a wider range further away from the strike- slip fault. When the same intrusive bodies were distributed in different drainage basins, its sediment was distributed in two alluvial fans, which makes its sedimentary signal distribution range wider. Conversely, the sedimentary area of an alluvial fan became narrower when restricted by larger adjacent fans. Due to the above relationships, the calculated strike- slip rate might be underestimated or overestimated using the offset amount between the strata with sedimentary signal and the source intrusive body. The experiment in this paper provide an important model for studying the source- to- sink system bounded by strike- slip faults.