［Objective］ The effects of gravel content and rainfall intensity on runoff and sediment production characteristics of engineering accumulation bodies composed of loam and aeolian sandy soil were investigated， in order to provide theoretical guidance and data support for effective soil erosion prevention in production and construction projects. ［Methods］ Indoor rainfall simulation experiments were conducted using soil-rock mixed accumulation bodies as representative engineering erosion underlay surfaces， while the runoff and sediment production characteristics were quantitatively analyzed under four gravel content levels （0， 10%， 20%， and 30%） and three rainfall intensities （1.0， 1.5， and 2.0 mm/min）. ［Results］ ① Both accumulation bodies exhibited a ‘first increasing， then fluctuating’ trend in runoff rate. Among them， aeolian sandy soil accumulation bodies demonstrated lower runoff rates and hydraulic power than those of loam under low rainfall intensities （1.0 and 1.5 mm/min）. However， they showed greater growth rates under high rainfall intensity （2.0 mm/min） and high gravel content （30%）， the aeolian sandy soil exhibited greater growth rates， reaching or even exceeding loam levels， indicating potential for more severe erosion under similar conditions. ② Erosion rates of both accumulation bodies increased with an increase in rainfall intensity and decreased with an increase in gravel content， with aeolian sandy soil consistently exhibiting higher erosion rates. And for aeolian sandy soil， maximum reductions in erosion rate occurred at 10% gravel content under 1.0 mm/min （11.89%） and 1.5 mm/min （73.10%） rainfall， and at 30% gravel content under 2.0 mm/min （26.16%） rainfall. For loam， maximum reductions occurred at 30% gravel content under 1.5 mm/min （75.23%） and 2.0 mm/min （56.35%） rainfall. ③ Aeolian sandy soil demonstrated 16.09%—26.92% reductions in hydraulic power at 10% gravel content relative to that in the pure soil. Loam exhibited 18.71%—23.13% reductions in hydraulic power at 30% gravel content under 1.5—2.0 mm/min rainfall， whereas gravel showed limited mitigation effects under 1.0 mm/min rainfall. ［Conclusion］ Aeolian sandy soil accumulation bodies demonstrated accelerated runoff rates and hydraulic power growth under high rainfall intensity （2.0 mm/min） and high gravel content （30%）， potentially leading to severe erosion which reaching or exceeding loam levels. For both soil types， erosion rates were positively correlated with rainfall intensity and negatively correlated with gravel content.