Abstarct: Flash floods are short-term events and have a peak flow which was caused by heavy rainfall and usually occur in small basin and just overflows from the edges of rivers and streams and washed and destroys all barriers on this way. The purpose of this study is experimental investigation of bed-load sediments transported by flood flow hydrograph. This research includes a series of flow hydrographs in different shapes( triangular, symmetric triangular and asymmetric triangular) and contains different baxse time and peak flow. Four grading of sediment with D_50=7mm , D_50=3.5mm ,D_50=1.85mm , and D_50=0.8mm are used. Existence or lack of the baxse flow on amount of transported bed load also checked by input flow hydrographs. The results show that with increasing discharge of 18 lit/s.m to 27, 40 and 50 lit/s.m the amount of sediment transported to downstream, respectively 110, 260 and 600% increases and also a temporal lag was found between the flow hydrographs peak and the sediment hydrograph peak about equal to 3-12% of flow hydrograph duration. Also existence of baxse flow in the erosion and sediment transport to downstream in efficient an by increasing the baxse flow the amount of sediment transported to downstream with symmetric triangle hydrographs more than asymmetric triangle hydrograph when baxse time peak flow is equal.