This article mainly targets on the investigated engineering spoils were typical of those placed during urban construction activities in Chongqing. Studied on physical and mechanical properties and infiltration characteristics of engineering accumulation body slope and determined the dangerous slip surface and safety factor of the slope of the engineering accumulation. The sampling points were arranged in the slope, the middle and the bottom and soil physical and mechanical properties were analyzed by collecting soil samples of the engineering accumulation, the infiltration process was studied by using the field double ring infiltration method, and the stability of the slope was analyzed by GEO-SLOPE software. The results showed as follows：(1)The grain size distribution of the engineering accumulation was not uniform, and the content of <2 mm particle size increased with the stacking time. The fractal dimension of each engineering accumulation varied from 2.04 to 2.47, and it showed up-slope>middle-slope>down-slope. (2) The saturated-water content of the engineering accumulation body gradually increases with the descending of the slope position; Infiltration rate with time showed three stages (rapid reduction, slow reduction, stable infiltration). The stable infiltration rates of the 2-month engineering accumulation (2 m), 2-year engineering accumulation (2 a) and 4-year engineering accumulation (4 a) were 4.53 mm/min, 3.17 mm/min and 7.02 mm/min, respectively. (3) The relationship between the shearing force and the shear displacement of the engineering accumulation in different stacking time is hardened; the cohesion values and internal frictional angles of all of the engineering accumulation were 16.43kPa ~31.88kPa and 2.23°~41.69°. The safety factors of the critical slip surfaces of the slopes underlain by the various engineering spoils were greater than 1.5, and the stability order is 2 years >2 months >4 years, the safety factor of the most dangerous sliding surface were 1.77, 2.23 and 1.66. By comparison, stacking 2 years of engineering accumulation body stability is the best, stacked in February of the second, stacked 4 years of accumulation of the worst stability.