In order to explore the influence of rainfall on infiltration characteristics and water holding capacity of engineering accumulation，laboratory basic soil physical properties analysis and field double ring infiltration methods were used to study the changes of infiltration characteristics and water holding capacity of engineering accumulation in different rainfall conditions and its influencing factors. The results showed that soil bulk density and soil porosity of engineering accumulation had significant differences in different rainfall conditions and slope positions. In different rainfall conditions, the soil bulk density of engineering accumulation of lower of slope from high to low were: Drought (Ⅰ)＞light rain (Ⅱ)＞moderate rain (Ⅲ)＞heavy rain (Ⅳ). Total porosity, capillary porosity, non-capillary porosity in different slope positions from high to low were: Lower＞middle＞top. In different rainfall conditions, the initial infiltration rate from high to low were: Drought (Ⅰ)＞light rain (Ⅱ)＞heavy rain (Ⅳ)＞moderate rain (Ⅲ), its size in order to 8.91, 5.52, 3.96, 3.25 mm/min. The stable infiltration rate from high to low were: Drought (Ⅰ)＞moderate rain (Ⅲ)＞light rain (Ⅱ)＞heavy rain (Ⅳ), its size in order to 4.40，1.45，1.32，0.53 mm/min. In different rainfall conditions, the maximal effective capacity of engineering accumulation of lower of slope from high to low were: Heavy rain (Ⅳ)＞light rain (Ⅱ)＞drought (Ⅰ)＞moderate rain (Ⅲ), its size in order to 469.03，402.48，378.11，321.88 t/hm2. In different slope positions of engineering accumulation, the field capacity of moderate rain condition was largest. The water-holding capacity of engineering accumulation had a significant positive correlation with total porosity, capillary porosity, non-capillary porosity and infiltration characteristics, while it had a significant negative correlation with soil bulk density. The results could provide important scientific evidence basis for the prevention and control of soil and water loss of engineering accumulation.