Field Scouring Experiment on the residues of shenfu dongdheng coalfield during exploitation was con- ducted with the method of simulate overland flow. Results showed that the shorter deposits time of the residues characterized the larger erodibility due to the gradually stable compaction after 4 to 7 years natural deposit process. Sediment load decreased with the order of residues of 1997 , residues of 1994, coal and gangue under the same overland flow. Moreover, linear relation lies in runoff, sediment and overland flow. Sediment concentration in mining-site residues kept a high level and turned irregularly with time, which revealed high erosion potential in these sites. It decreased and approached to a constant in the last. In addition , debris flow goes with the runoff and sediment processes.